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Arius · 327 · Letter
This brief letter represents Arius's direct appeal to Emperor Constantine around 327, written during his exile following the Council of Nicaea. The Alexandrian presbyter had been condemned for his teaching that the…
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Athanasius of Alexandria · 329–373 · Letter
The Festal Letters are annual pastoral epistles that Athanasius of Alexandria wrote each year from 329 to 373 CE to announce the date of Easter and provide spiritual instruction to the churches…
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Eusebius of Caesarea · 333 · Treatise
Eusebius of Caesarea composed this theological treatise around 333, in the immediate aftermath of Constantine's legalization of Christianity and the Council of Nicaea. Writing as both historian and apologist, Eusebius sought to…
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Eusebius of Caesarea · 337–339 · Book
Written shortly after Emperor Constantine's death in 337, Eusebius of Caesarea's Life of Constantine stands as the earliest and most influential biography of the first Christian emperor. Eusebius, who served as bishop…
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Athanasius of Alexandria · 337–346 · Treatise
This brief treatise by Athanasius of Alexandria takes its title from Christ's words in Matthew 11:27: "All things have been delivered to me by my Father." Written during the height of the…
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Statement of Faith Declaration of Faith, in Latin and the Original Greek
Athanasius of Alexandria · 340–360 · Treatise
The Declaration of Faith represents one of several shorter credal statements attributed to Athanasius of Alexandria, the fourth-century bishop who served as the primary defender of Nicene orthodoxy against Arianism. Written during…
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Cyril of Jerusalem · 348–350 · Treatise
The Catechetical Lectures represent one of the most complete surviving records of fourth-century Christian initiation practices. Delivered by Cyril, Bishop of Jerusalem, between 348 and 350, these twenty-four lectures were given to…
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Cyril of Jerusalem · 348–350 · Sermon
The Mystagogical Catecheses comprise five sermons delivered by Cyril, Bishop of Jerusalem, to newly baptized Christians during Easter week in the late 340s. These addresses were given in the Church of the…
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Catechetical Lectures Nicene and Post-Nicene Fathers Series II Volume VII - Cyril of Jerusalem
Cyril of Jerusalem · 348–350 · Book
Cyril of Jerusalem's Catechetical Lectures represent one of the earliest and most complete systems of Christian instruction for new converts, delivered during his tenure as Bishop of Jerusalem from around 348 to…
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Wulfila (Ulfilas) and associates · 350 · Scripture
Associated with Wulfila (Ulfilas), the fourth-century bishop who worked among the Goths and is credited with devising the Gothic alphabet for the purpose, the Gothic Bible is the earliest substantial literary monument…
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Hilary of Poitiers · 350–367 · Poem
Hilary of Poitiers composed these three surviving hymns during his years of exile in Phrygia, imposed by Emperor Constantius II between 356 and 360 for his opposition to Arianism. Writing in a…
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Ephrem the Syrian · 350–363 · Poem
Ephrem the Syrian's Hymns Against Heresies emerged from the theological battlegrounds of fourth-century Mesopotamia, where Christian communities faced sustained challenges from Arian, Marcionite, and Manichaean teachings. Writing between 350 and 363 in…
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Ephrem the Syrian · 350–373 · Other
The hymns and homilies of Ephrem the Syrian emerge from the theological battles and pastoral challenges of fourth-century Mesopotamia. Writing in Syriac from his base in Nisibis and later Edessa, Ephrem composed…
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Ephrem the Syrian · 350–370 · Poem
The Madrāšē d-Haymənutā (Hymns on Faith) represent Ephrem the Syrian's poetic response to the Arian controversy that threatened to divide fourth-century Christianity. Writing from Nisibis and later Edessa between 350 and 370,…
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Pachomius · 350–400 · Other
The Life of Saint Pachomius emerges from the fourth-century Egyptian desert, where the great monastic pioneer established the first organized Christian cenobitic communities along the Nile. Originally composed in Coptic during the…
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Ephrem the Syrian · 350–363 · Poem
The Carmina Nisibena (Songs of Nisibis) is a collection of seventy-seven hymns composed by Ephrem the Syrian between 350 and 363 CE in response to the repeated Persian sieges of his native…
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Athanasius of Alexandria · 350 · Treatise
Written around 350 CE, this treatise emerges from Athanasius's urgent need to defend the Council of Nicaea against sustained Arian attacks. Two decades after the council condemned Arianism, opponents were claiming that…
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Hilary of Poitiers · 350–367 · Other
Hilary of Poitiers emerged as one of the West's most formidable defenders of Nicene orthodoxy during the turbulent decades following the Council of Nicaea. Writing between 350 and 367, his selected works…
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Hilary of Poitiers · 356–367 · Commentary
Hilary of Poitiers composed this commentary on Matthew's Gospel during his exile in Phrygia between 356 and 360, imposed by Emperor Constantius II for his opposition to Arianism. Writing from enforced isolation…
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Hilary of Poitiers · 356–359 · Treatise
Hilary of Poitiers composed this monumental treatise on the Trinity during his exile in Phrygia between 356 and 359, imposed by the Arian emperor Constantius II for his defense of Nicene orthodoxy.…
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Athanasius of Alexandria · 356–361 · Treatise
Athanasius of Alexandria's Four Discourses Against the Arians stands as the most comprehensive theological refutation of Arianism produced during the fourth-century Christological crisis. Written between 356 and 361 during Athanasius's third exile…
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Hilary of Poitiers · 356 · Letter
Hilary of Poitiers composed this urgent letter to Emperor Constantius II around 356, while in exile for his defense of Nicene orthodoxy against Arianism. Writing from Phrygia where the emperor had banished…
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Athanasius of Alexandria · 357 · Treatise
Athanasius of Alexandria's Apologia contra Arianos emerged from the bitter ecclesiastical conflicts of the fourth century, when the teachings of Arius threatened to reshape Christian understanding of Christ's divinity. Written around 357…
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Athanasius of Alexandria · 357 · Treatise
Written in 357 during his third exile, Athanasius of Alexandria's defense to Emperor Constantius II represents one of the most politically charged moments in the Arian controversy. Accused of sedition and treason…
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