In the early fourth century, Christianity emerged from generations of intermittent persecution into an entirely different political world. Emperor Constantine’s rise brought imperial favor to a religion that had recently faced confiscations, imprisonment, and execution under Diocletian and his successors. Churches could be rebuilt, bishops could meet more openly, and disputes that had once remained regional could suddenly become questions debated across the Roman Empire.
One of those disputes began in Alexandria and became one of the defining theological controversies in Christian history.
At its center stood Arius, a presbyter of the Alexandrian church whose teaching about the relationship between God the Father and Jesus Christ brought him into conflict with his bishop, Alexander of Alexandria. What began as a dispute among Egyptian clergy soon drew in bishops from Palestine, Syria, Asia Minor, and eventually the emperor himself. The controversy helped produce the Council of Nicaea in 325, the Nicene Creed, decades of competing councils and creeds, the careers of figures such as Athanasius and Eunomius, and eventually the theological settlement associated with the Council of Constantinople in 381.
Yet calling the entire conflict simply “Arianism” can be misleading. Arius was enormously important at the beginning, but the theological coalitions that developed afterward were not one unified Arian party. Homoousians, Homoiousians, Homoians, Anomoeans, and other groups argued over language that could define the relationship between Father and Son. Modern scholars such as R. P. C. Hanson and Lewis Ayres have therefore emphasized that the fourth-century controversy was far more complicated than a straightforward struggle between Arius and an already fully formed Nicene orthodoxy.
The argument began with a deceptively simple question: if God the Father is eternal, unbegotten, and without beginning, in what sense is the Son also divine?
Arius of Alexandria
Much about Arius’s early life remains uncertain. He was probably born in the middle of the third century and eventually became a presbyter in Alexandria, one of the most important intellectual and ecclesiastical centers of the Christian world. By the early fourth century he was serving the Alexandrian church when disagreement developed between him and Bishop Alexander.
The difficulty in reconstructing Arius’s thought is that most of his writings have disappeared. His theological work, the Thalia, survives only in fragments quoted largely by hostile writers such as Athanasius. Several letters attributed to Arius, however, preserve something much closer to his own voice. These are particularly valuable because later Nicene writers frequently used “Arian” as a broad label for positions they opposed.
In a letter to Eusebius of Nicomedia, preserved by Theodoret, Arius complained that Alexander had driven him and his supporters from Alexandria. Arius explained that the dispute concerned Alexander’s insistence upon the eternal coexistence of Father and Son. Arius instead maintained that the Father existed without beginning while the Son possessed an origin.
That did not mean Arius regarded Christ as merely an ordinary human being. His surviving letter describes the Son as existing before the ages, “full of grace and truth,” and as God’s only-begotten Son. Yet Arius also insisted that the Son was not unbegotten and did not share the Father’s existence in precisely the same manner. One surviving formulation states that “the Son has a beginning, but God is without beginning.”
The distinction was fundamental.
For Arius, the absolute uniqueness and transcendence of the Father had to be protected. The Father alone was without origin. The Son owed his existence to the Father’s will and therefore could not possess the same unbegotten existence as the Father.
Alexander believed this understanding threatened Christian belief in the divinity and saving work of Christ.
Alexander Condemns Arius
Alexander did not treat the disagreement as an obscure theological debate that could remain inside Alexandria. He assembled clergy, condemned Arius and his supporters, and circulated letters warning other bishops about their teachings.
Alexander’s surviving documents are among the earliest primary sources for the controversy. In his letter concerning Arius’s deposition, he named clergy who had joined Arius and described their removal from communion. His writings also show that the dispute had already expanded beyond a disagreement between two individuals. Arius possessed supporters, correspondents, and influential allies elsewhere in the eastern church.
One of the most important was Eusebius of Nicomedia.
Arius appealed directly to Eusebius after his condemnation, presenting himself as a victim of persecution by Alexander. Eusebius’s support gave the Alexandrian presbyter access to a much wider ecclesiastical network. Soon letters were moving between bishops, synods were being held, and competing descriptions of the dispute circulated throughout the eastern provinces.
The controversy was spreading at precisely the moment Constantine was completing his conquest of the Roman Empire.
Constantine Inherits a Church Divided
Constantine defeated Licinius in 324 and became sole ruler of the empire. The emperor had already shown growing interest in Christian affairs, but political unity now placed a religious dispute in Alexandria directly before an emperor who wanted stability.
Christianity was not a private organization isolated from imperial society. Bishops controlled increasingly important institutions, Christian communities stretched across the empire, and Constantine had tied his own patronage to the church. A bitter theological dispute involving some of the most prominent bishops in the East therefore had implications far beyond a single congregation.
Attempts at reconciliation failed.
Constantine consequently summoned bishops to meet in 325 at Nicaea in Bithynia, near the imperial residence at Nicomedia. The resulting gathering became the First Council of Nicaea and later came to be recognized as the first ecumenical council of Christianity.
A local quarrel in Alexandria had become an imperial church crisis.
The Council of Nicaea
The surviving documents from Nicaea show that the council addressed several ecclesiastical problems, but the controversy surrounding Arius became its most famous theological issue.
The creed adopted by the council declared Jesus Christ to be the Son of God, “begotten, not made,” and homoousios with the Father. The Greek term homoousios is commonly translated “of one substance” or “consubstantial.”
The creed then moved beyond a positive confession of faith and directly rejected several formulations associated with Arius. It anathematized those who said there was a time when the Son did not exist, that he came from things that did not exist, or that he was a creature or subject to change.
The wording was designed to close the theological space in which Arius’s teaching operated.
Yet even homoousios required explanation.
Eusebius of Caesarea, who attended the council, later wrote to his own church explaining why he had accepted the Nicene formula. His letter is especially important because it reveals that bishops did not necessarily arrive at Nicaea already using identical theological language. Eusebius described both the creed he had presented and the modifications accepted by the council, while explaining how he understood the disputed terminology.
Nicaea therefore produced an enormously important statement of faith, but it did not instantly settle every theological question surrounding the Father and Son.
The controversy would continue for more than half a century.
Nicaea Did Not End Arianism
It is easy to imagine Christian history moving in a straight line from Arius to Nicaea and then from Nicaea to the triumph of Nicene Christianity. The historical record is much less orderly.
Arius was condemned, but many bishops who had theological reservations about Nicene language remained influential. Some had sympathy for Arius. Others rejected Arius’s more controversial statements while also questioning whether homoousios was the best term for defining Father and Son. Still others were motivated by personal, ecclesiastical, regional, and political rivalries that cannot be reduced to a single theological faction.
Constantine himself gradually permitted some of Arius’s supporters to return from exile. Arius sought restoration to communion, while opposition to Athanasius, Alexander’s eventual successor as bishop of Alexandria, intensified.
Athanasius would become the most famous defender of Nicene theology, but his career was anything but peaceful. He was repeatedly exiled as emperors, councils, and rival bishops struggled over theology and ecclesiastical authority.
The theological landscape became increasingly complicated.
This is one reason modern scholarship is cautious about describing every opponent of Athanasius or critic of homoousios as simply “Arian.” Lewis Ayres has emphasized the diversity and instability of fourth-century theological coalitions, while Hanson’s massive study separates original Arian teaching from later Homoian and Neo-Arian developments.
The arguments after Nicaea were not merely repetitions of what Arius had said before 325.
Athanasius and the Memory of Arius
Much of what later generations learned about Arius came through Athanasius.
That makes Athanasius indispensable, but it also requires historians to read him carefully.
In works such as De Synodis, Defense of the Nicene Definition, the Discourses Against the Arians, and History of the Arians, Athanasius presented the controversy as a struggle over the true identity of Christ. His writings preserve creeds, theological arguments, fragments of lost documents, and material from Arius’s Thalia that might otherwise have disappeared.
Athanasius quotes positions attributed to Arius asserting that the Son was produced from nothing and that there was a point at which he did not exist. He then argues that the Nicene term homoousios was necessary because biblical language such as “from God” could otherwise be interpreted in different ways.
For Athanasius, salvation itself was involved. If Christ were merely a creature, however exalted, then the relationship between humanity and God established through Christ would be fundamentally different.
His arguments eventually became enormously influential, but during much of Athanasius’s own lifetime the outcome was far from certain.
A Century of Creeds
The decades after Nicaea witnessed repeated attempts to find language capable of producing theological agreement.
Councils met at Antioch, Sirmium, Ariminum, Seleucia, and elsewhere. New formulas appeared. Bishops were condemned, restored, transferred, and exiled. Imperial involvement changed as emperors changed.
The argument increasingly centered upon how terms such as ousia, substance or essence, and hypostasis, subsistence or person, should be understood.
Some Christians supported homoousios, meaning that the Son was of the same substance as the Father.
Others became associated with homoiousios, usually understood as the Son being like the Father in substance.
The Homoians attempted to avoid some of the controversial philosophical terminology by confessing that the Son was “like” the Father according to Scripture.
The Anomoeans or Neo-Arians, associated particularly with Aetius and Eunomius, pushed the distinction between Father and Son much further. Eunomius argued that the Father’s defining characteristic was being unbegotten, something the begotten Son therefore could not share in the same sense.
These distinctions matter because a bishop described polemically as an “Arian” might actually have rejected important elements of Arius’s own theology.
Athanasius’s De Synodis is especially valuable for this period because it preserves and discusses numerous competing fourth-century creeds. Even though Athanasius wrote as a committed partisan, the documents embedded within his work allow historians to see just how fragmented the theological landscape had become.
The “Arian controversy” had outgrown Arius.
Emperors, Bishops, and Exile
The controversy also demonstrates how thoroughly imperial politics had become intertwined with Christian church government.
Constantine called Nicaea. His sons inherited both the empire and its religious divisions. Constantius II, who eventually ruled the entire empire, supported theological settlements that differed from the increasingly firm Nicene position championed by Athanasius.
Councils were summoned with imperial support. Bishops could be banished. Rival claimants to episcopal offices appealed to political authorities. Theological statements could become instruments for restoring communion or excluding opponents.
This does not mean emperors simply invented the doctrines under discussion. Bishops and theologians argued from Scripture, inherited Christian traditions, philosophical terminology, liturgy, and previous theological debates. Imperial authority could influence who assembled, who was exiled, and which settlement received institutional backing, but emperors could not eliminate the underlying theological disagreements by decree.
The controversy instead became a prolonged negotiation between theology, episcopal authority, regional networks, and imperial power.
That process lasted through several reigns.
The Rise of Pro-Nicene Theology
By the later fourth century, the intellectual foundations of what historians commonly call pro-Nicene theology had become considerably stronger.
Athanasius remained important, but the Cappadocian Fathers, Basil of Caesarea, Gregory of Nazianzus, and Gregory of Nyssa, helped refine the language used to describe the Trinity. Their work contributed to a theological vocabulary in which Christians could confess one divine ousia while distinguishing three hypostaseis.
The distinction helped answer a problem that had troubled the controversy for decades. Christians wanted to affirm the full divinity of the Son without collapsing Father and Son into one person, while also maintaining monotheism.
At the same time, debate expanded more explicitly to the status of the Holy Spirit.
The dispute that had begun with Arius and Alexander over the relationship of Father and Son was becoming part of a more developed Trinitarian theology.
Political circumstances changed as well.
Theodosius I came to power in the East and favored Nicene Christianity. In 381 bishops assembled at Constantinople for the council later recognized as the First Council of Constantinople and the second ecumenical council.
Its first canon reaffirmed the faith associated with Nicaea and explicitly condemned a range of competing theological groups, including Eunomians, Arians or Eudoxians, and other movements.
By then Arius had been dead for decades, but his name had become attached permanently to a much larger theological struggle.
From the Roman Empire to the Goths
The history of Arian Christianity did not end at Constantinople.
One of its most significant later chapters unfolded among peoples beyond and within the Roman frontiers, particularly the Goths.
The missionary bishop Ulfilas, also known as Wulfila, played an important role in the Christianization of Gothic communities during the fourth century. A creed associated with him survives through Auxentius of Durostorum and reflects what scholars generally classify more precisely as Homoian Christianity rather than the exact theology of Arius.
That distinction is significant.
Later historical sources routinely called Goths and other Germanic Christians Arians, but “Gothic Arianism” often represented the Homoian Christianity that had become influential during the later imperial controversy. The Gothic churches did not simply preserve every theological position Arius had taught in Alexandria decades earlier.
Nevertheless, the label became standard.
As Visigoths, Ostrogoths, Vandals, and other Germanic peoples established kingdoms inside former territories of the western Roman Empire, forms of non-Nicene Christianity became associated with several ruling dynasties.
The result gave the old fourth-century controversy a new political and ethnic setting.
The Vandals and North Africa
Nowhere was the division more dramatic than in Vandal North Africa.
The Vandals established their kingdom during the fifth century and adhered to the form of Christianity traditionally described as Arian. Much of the Roman population of North Africa, meanwhile, remained Nicene.
Victor of Vita’s History of the Vandal Persecution became one of the most important surviving accounts of the resulting conflict. Victor wrote from a Nicene perspective and therefore must be read with awareness of his theological commitments, but his work preserves valuable evidence concerning churches, bishops, religious policy, exile, confiscation, and persecution.
Procopius, writing during the sixth-century wars of Emperor Justinian, similarly identified Vandals, Goths, Visigoths, and Gepids with the Arian faith. His testimony demonstrates how firmly the religious distinction had become connected in historical writing with the post-Roman kingdoms. The primary-source material assembled for this subject likewise identifies Procopius and Victor of Vita as essential evidence for this later phase of Arian or Homoian Christianity.
The controversy was no longer centered upon Alexandrian presbyters arguing over theological terminology. It now influenced relations between kings and subjects across former Roman provinces.
Visigothic Spain and the Third Council of Toledo
The Visigothic kingdom provides one of the clearest examples of the eventual disappearance of royal Arian Christianity in western Europe.
For generations, Visigothic rulers followed Arian or Homoian Christianity while much of the Hispano-Roman population remained Nicene. That division began to collapse under King Reccared I.
Reccared abandoned his kingdom’s Arian confession and embraced Nicene Christianity. In 589, the Third Council of Toledo formally celebrated and consolidated the change.
The council therefore represents one of the major endpoints in the long history that began with Arius in Alexandria.
The theological question first argued during the early fourth century had crossed languages, empires, kingdoms, and generations. It had survived the death of Arius, the Council of Nicaea, the rise of Athanasius, the theological struggles of Constantius II, the settlement of Constantinople, and the collapse of Roman government in the West.
By the end of the sixth century, however, the major Germanic kingdoms that had once preserved non-Nicene Christianity were increasingly entering the Nicene religious world.
Was Arianism Almost Victorious?
It is sometimes said that there was a moment when the Christian world “almost became Arian.”
There is some truth behind the dramatic phrase, but it can also distort the historical situation.
During portions of the fourth century, Nicene bishops could indeed find themselves politically marginalized, while emperors and influential bishops supported formulas unacceptable to Athanasius and other Nicene leaders. Homoian theology achieved considerable institutional influence, and the repeated councils after 325 demonstrate that Nicaea’s language did not immediately command universal agreement.
Yet there was never one unified Arian church standing opposite one unified Nicene church.
The situation involved competing networks and shifting theological positions. Some opponents of homoousios also opposed Arius. Some theological positions changed over time. Bishops who appeared together at one council might separate over the next creed.
That complicated reality is one of the central conclusions of modern scholarship.
R. P. C. Hanson’s study devotes separate treatments to Arius, early supporters, the decades of creed-making, Homoian theology, Neo-Arianism, Athanasius, the Cappadocians, and the doctrine of the Holy Spirit precisely because the controversy developed dramatically between 318 and 381.
Arianism came close to becoming an umbrella term even in antiquity. Historians must therefore continually ask what a particular source means when it calls someone an Arian.
Arius Through the Eyes of His Enemies
Another difficulty remains.
Arius lost.
That fact shaped the surviving record.
His Thalia does not survive as a complete independent manuscript. Much of what remains comes through Athanasius, one of his theological opponents. Alexander’s writings describe Arius as a dangerous heretic. Later ecclesiastical historians inherited a Christian world in which the Nicene settlement had become orthodoxy.
Arius’s surviving letters are therefore exceptionally important because they allow historians, however imperfectly, to compare Arius’s own formulations with the descriptions written by his opponents.
The difference does not rehabilitate or condemn his theology. It simply permits better history.
Arius clearly taught ideas that the Nicene settlement rejected. He insisted upon a real distinction between the unbegotten Father and the begotten Son and denied the eternal relationship envisioned by Alexander. At the same time, some simplified accounts go too far when they portray Arius as merely teaching that Jesus was an ordinary created human being. His actual surviving statements describe a preexistent Son who existed before the ages and occupied an extraordinary place in the divine economy.
Understanding that distinction makes the controversy more comprehensible, not less significant.
Arian Is Not Aryan
The spelling has created one particularly persistent historical misunderstanding.
Arian and Aryan have nothing to do with one another.
Arianism takes its name from Arius, the fourth-century Christian presbyter whose dispute with Alexander helped produce the Council of Nicaea.
Aryan derives from ancient Indo-Iranian terminology represented by Sanskrit ārya and related Iranian forms. Centuries later, European linguists and racial theorists expanded and distorted that terminology, eventually producing the racial concept of an “Aryan race.” The word was further transformed by nineteenth-century racialism and twentieth-century Nazi ideology.
There is no historical pathway connecting Arius with Aryan racial theory.
The distinction is especially important because both terms appear frequently in discussions of religion. Arian belongs to the history of Christian theology. Aryan belongs originally to ancient Indo-Iranian linguistic and cultural history and, in its later racial meaning, to the history of nationalism, racial pseudoscience, antisemitism, and Nazi ideology. Your research material rightly treats the two subjects separately and traces their entirely different bodies of primary evidence.
Confusing them creates a connection that never existed.
The Legacy of the Arian Controversy
Arius could hardly have anticipated what followed his dispute with Alexander.
Within a few years emperors and bishops were debating the controversy across the Roman world. Nicaea introduced language that would become central to Christian theology. Athanasius spent much of his career fighting over its meaning. Councils proposed alternative creeds. Theologians refined the language of substance, person, generation, and divinity. The Cappadocians helped formulate a Trinitarian vocabulary that would outlive the Roman Empire itself.
Then the controversy crossed another frontier.
Gothic Christians carried Homoian traditions into the developing kingdoms of the West. Vandal rulers governed a largely Nicene North African population. Visigothic kings maintained a separate religious confession until Reccared and the Third Council of Toledo brought their kingdom into Nicene Christianity.
By then “Arian” meant considerably more than the precise ideas taught by Arius.
That may be the most important fact to remember about the controversy. Arianism was born from a specific theological dispute, but history transformed the name into a category stretching across nearly three centuries of Christian argument, imperial politics, missionary activity, and post-Roman kingdoms.
The Council of Nicaea did not instantly end that history. It began a new phase of it.
When the Council of Constantinople reaffirmed Nicene theology in 381, the church had spent more than fifty years arguing over what Nicaea meant and how Christians should speak about Father, Son, and Holy Spirit. Its conclusions became foundational for most later Catholic, Orthodox, and eventually Protestant Christianity.
Arius’s own theology did not prevail.
The questions raised by the controversy, however, helped shape the language with which much of Christianity has described God ever since.
Sources & Further Reading
Arius. “Letter to Eusebius of Nicomedia.” In Theodoret of Cyrrhus, Ecclesiastical History, 1.4. Translated by Blomfield Jackson. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 3. Buffalo, NY: Christian Literature Publishing Co., 1892. https://www.newadvent.org/fathers/27021.htm
Arius. “Letter to Alexander of Alexandria.” In The Trinitarian Controversy, edited and translated by William G. Rusch. Sources of Early Christian Thought. Philadelphia: Fortress Press, 1980. https://www.jstor.org/stable/j.ctv1hqdhpx
Arius. “Letter to Emperor Constantine.” In The Trinitarian Controversy, edited and translated by William G. Rusch. Sources of Early Christian Thought. Philadelphia: Fortress Press, 1980. https://www.jstor.org/stable/j.ctv1hqdhpx
Alexander of Alexandria. “Epistles on the Arian Heresy and the Deposition of Arius.” In Ante-Nicene Fathers, vol. 6. Buffalo, NY: Christian Literature Publishing Co., 1886. https://www.newadvent.org/fathers/0622.htm
Alexander of Alexandria. “Deposition of Arius.” In Nicene and Post-Nicene Fathers, 2nd ser., vol. 4. Buffalo, NY: Christian Literature Publishing Co., 1892. https://www.newadvent.org/fathers/2803.htm
First Council of Nicaea. “The Nicene Creed, Canons, and Synodal Letter.” 325. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 14. Buffalo, NY: Christian Literature Publishing Co., 1900. https://www.newadvent.org/fathers/3801.htm
Eusebius of Caesarea. “Letter to the People of His Diocese concerning the Council of Nicaea.” In Nicene and Post-Nicene Fathers, 2nd ser., vol. 4. Buffalo, NY: Christian Literature Publishing Co., 1892. https://www.newadvent.org/fathers/2804.htm
Eusebius of Caesarea. Life of Constantine. Translated by Ernest Cushing Richardson. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 1. Buffalo, NY: Christian Literature Publishing Co., 1890. https://www.newadvent.org/fathers/2502.htm
Athanasius of Alexandria. Defense of the Nicene Definition. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 4. Buffalo, NY: Christian Literature Publishing Co., 1892. https://www.newadvent.org/fathers/2809.htm
Athanasius of Alexandria. Four Discourses Against the Arians. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 4. Buffalo, NY: Christian Literature Publishing Co., 1892. https://www.newadvent.org/fathers/2816.htm
Athanasius of Alexandria. De Synodis: On the Councils of Ariminum and Seleucia. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 4. Buffalo, NY: Christian Literature Publishing Co., 1892. https://www.newadvent.org/fathers/2817.htm
Athanasius of Alexandria. Apologia Contra Arianos. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 4. Buffalo, NY: Christian Literature Publishing Co., 1892. https://www.newadvent.org/fathers/2808.htm
Athanasius of Alexandria. History of the Arians. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 4. Buffalo, NY: Christian Literature Publishing Co., 1892. https://www.newadvent.org/fathers/2815.htm
Athanasius of Alexandria. “Synodal Letter to the Bishops of Africa.” In Nicene and Post-Nicene Fathers, 2nd ser., vol. 4. Buffalo, NY: Christian Literature Publishing Co., 1892. https://www.newadvent.org/fathers/2819.htm
Hilary of Poitiers. On the Trinity. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 9. New York: Christian Literature Company, 1899. https://www.newadvent.org/fathers/3302.htm
Socrates Scholasticus. Ecclesiastical History. Translated by A. C. Zenos. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 2. Buffalo, NY: Christian Literature Publishing Co., 1890. https://www.newadvent.org/fathers/2601.htm
Sozomen. Ecclesiastical History. Translated by Chester D. Hartranft. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 2. Buffalo, NY: Christian Literature Publishing Co., 1890. https://www.newadvent.org/fathers/2602.htm
Theodoret of Cyrrhus. Ecclesiastical History. Translated by Blomfield Jackson. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 3. Buffalo, NY: Christian Literature Publishing Co., 1892. https://www.newadvent.org/fathers/2702.htm
Philostorgius. Ecclesiastical History. Epitomized by Photius. Translated by Edward Walford. London: Henry G. Bohn, 1855. https://www.tertullian.org/fathers/philostorgius.htm
Gregory of Nazianzus. Theological Orations. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 7. New York: Christian Literature Company, 1894. https://www.newadvent.org/fathers/3102.htm
First Council of Constantinople. “Canons of the Council of Constantinople.” 381. In Nicene and Post-Nicene Fathers, 2nd ser., vol. 14. Buffalo, NY: Christian Literature Publishing Co., 1900. https://www.newadvent.org/fathers/3808.htm
Theodosius II. Codex Theodosianus, Book 16. 438. Translated selections in the Internet Medieval Sourcebook. Fordham University. https://sourcebooks.fordham.edu/source/codex-theod1.asp
Procopius. History of the Wars, Books 3–4, The Vandalic War. Translated by H. B. Dewing. Cambridge, MA: Harvard University Press, 1916. https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Procopius/Wars/3A*.html
Victor of Vita. History of the Vandal Persecution. Translated by John Moorhead. Liverpool: Liverpool University Press, 1992. https://www.jstor.org/stable/jj.38238817
Gregory of Tours. The History of the Franks. Translated by Lewis Thorpe. Harmondsworth: Penguin Books, 1974. https://archive.org/details/historyoffranks00greg
Rusch, William G., ed. and trans. The Trinitarian Controversy. Sources of Early Christian Thought. Philadelphia: Fortress Press, 1980. https://www.jstor.org/stable/j.ctv1hqdhpx
Hanson, R. P. C. The Search for the Christian Doctrine of God: The Arian Controversy, 318–381. Edinburgh: T&T Clark, 1988. https://books.google.com/books?id=wkbZAAAAMAAJ
Williams, Rowan. Arius: Heresy and Tradition. 2nd ed. Grand Rapids, MI: William B. Eerdmans Publishing Company, 2002. https://www.eerdmans.com/9780802849694/arius/
Ayres, Lewis. Nicaea and Its Legacy: An Approach to Fourth-Century Trinitarian Theology. Oxford: Oxford University Press, 2004. https://academic.oup.com/book/3350
Wiles, Maurice. Archetypal Heresy: Arianism Through the Centuries. Oxford: Oxford University Press, 2001. https://academic.oup.com/book/10915
Parvis, Sara. Marcellus of Ancyra and the Lost Years of the Arian Controversy, 325–345. Oxford: Oxford University Press, 2006. https://academic.oup.com/book/6380
Vaggione, Richard Paul. Eunomius of Cyzicus and the Nicene Revolution. Oxford: Oxford University Press, 2001. https://academic.oup.com/book/54617
Kopecek, Thomas A. A History of Neo-Arianism. 2 vols. Cambridge, MA: Philadelphia Patristic Foundation, 1979. https://books.google.com/books/about/A_History_of_Neo_Arianism.html?id=qCz2zAEACAAJ
Berndt, Guido M., and Roland Steinacher, eds. Arianism: Roman Heresy and Barbarian Creed. Farnham, UK: Ashgate, 2014. https://www.routledge.com/Arianism-Roman-Heresy-and-Barbarian-Creed/Steinacher-Berndt/p/book/9781409446590
Anatolios, Khaled. Athanasius: The Coherence of His Thought. London: Routledge, 1998. https://www.routledge.com/Athanasius-The-Coherence-of-his-Thought/Anatolios/p/book/9780203008904
Barnes, Timothy D. Athanasius and Constantius: Theology and Politics in the Constantinian Empire. Cambridge, MA: Harvard University Press, 1993. https://books.google.com/books?q=Timothy+Barnes+Athanasius+and+Constantius
Gwynn, David M. The Eusebians: The Polemic of Athanasius of Alexandria and the Construction of the “Arian Controversy.” Oxford: Oxford University Press, 2007. https://books.google.com/books?q=David+Gwynn+The+Eusebians
Heather, Peter, and John Matthews. The Goths in the Fourth Century. Liverpool: Liverpool University Press, 1991. https://www.jstor.org/stable/j.ctv1na9z73
Mathisen, Ralph W. Roman Aristocrats in Barbarian Gaul: Strategies for Survival in an Age of Transition. Austin: University of Texas Press, 1993. https://books.google.com/books?q=Ralph+Mathisen+Roman+Aristocrats+in+Barbarian+Gaul