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Ambrose letter to Emperor Theodosius after the massacre at Thessalonica
Ambrose's Letters 17 and 18 to Valentian II in response to Symmachus' Plea for the restoration of The Altar of Victory to the Roman Senate House (dating from the year 384).

Ambrose's Letter 20 to his sister Marcellina about the events of Holy Week 385 or 6

Ambrose Letter 40 to the Emperor Theodosius about the Synagogue in Callinicum

Apollinaris, Apollinarius, his teaching on Christology from fragments of his writings

Aristides Apology, chapters 1 - 2 and 15 - 17

Arius letter to Alexander of Alexandria as found in Athanasius, De Synodis, 16

Arius letter to Eusebius of Nicomedia as found in Theodoret and Epiphanius. Arius speaks about his Christology.

Arius, the Thalia of, as found in Athanasius, Adversus Arianos Oratio Prima, 1. 5 and De Synodis, 15

Athanasius on the atonement

Athanasius on the Beginnings of Heresy about The Holy Spirit from Letter to Serapion

Athanasius De Synodis, 22-25 - the creeds of the Council of Antioch in 341

Athanasius 39th Festal Letter stating the Canonical books of the New Testament

Athanasius The Life of Antony, chapters 5 - 10 and 89 - 94

Athanasius Oration III against the Arians, chapters 29 - 34 - on the Word made flesh and the two natures of Christ
Athanasius Tomus ad Antiochenos, chapters 3 - 7 - The letter sent from the council of 362 to the Church in Antioch

Augustine Letter 93 to Vincentius -  the use of coercion

Augustine Letter 189 to Boniface - should Christian serve in the military?

Augustine on how he was influenced by Ambrose from Confessions, 5. 13. 23 - 14. 25.

Augustine on how he was influenced by the reading of Cicero's Hortensius. Confessions 3. 3. 6 - 5. 9

Augustine on his conversion from Confessions 8. 12. 28-30

Augustine on The Cross from Contra Faustum, 14

Augustine on the episcopate

Augustine on free will

Augustine on Hymn Singing in Milan during the time of Ambrose, from Confessions, 9. 7. 15

Augustine on Nature and Grace, from De Natura et Gratia, 3-6

Augustine on Pelagianism - a selection from De Haeresibus, chapter 88

Augustine - Pelagius and his denial of Original Sin from De Peccato Originali, 13.

Augustine on Philosophy and Theology / Christianity and Pagan learning from De Doctrina Christiana (On Christian Doctrine), 40 (60, 61)
Augustine on Plato's Forms / Ideas, De Diversis Quaestionibus Octoginta Tribus, 46

Augustine on The Relation of the Old and the New Testaments from De Utilitate Credendi 9.3.

Augustine on the Septuagint from De Civitate Dei 18. 41-43
Augustine Sermon 272 on The Eucharist.

Augustine on The Trinity from De Trinitate, 9

Augustine on The Trinity and The Holy Spirit from De Trinitate, 5.10.11 - 5.13.14; 15.17.30 - 15.17.31; 15.19.37
Augustine on The Trinity and The Holy Spirit and whether The Spirit proceeds from The Father only or from The Father and The Son, from In Evangelium Ioannis tractatus, 99: 6 - 9

Augustine on War from Contra Faustum, 22. 69 - 76

Barnabas, Epistle of, 9: 6-9, and 12: 1-7. The Greek text is from the Kirsopp Lake edition of the Apostolic Fathers.

Basil the Great - Address To Young Men On The Right Use Of Greek Literature

Basil the Great on God's Essence and God's Attributes - Letter 234 to Amphilochius.

Basil the Great on the divinity of the Holy Spirit - Letter 159 to Eupaterius and his daughter

Basil the Great, Letter 2 to Gregory of Nazianzus about ascetic life at Annesos

Basil the Great on Ousia and Hypostasis

Basil the Great Regulae Fusius Tractatae - selections from 7.

Basil the Great Homily on Psalm 15 (Septuagint 14) against usury.

Bede on the martyrdom of Alban - Historia Ecclesiastica Gentis Anglorum, 1. 7.

Canons of the Council of Carthage (417 or 418) on sin and grace - directed against Pelagius and Celestius.

Canons of the Council of Chalcedon, 451

Canons of the Council of Constantinople, 381

Canons of the Council of Elvira, first decade of fourth century

Canons of the Council of Ephesus, 431

Canons of the Council of Nicaea, 325

The Chalcedonian Definition

Chalcedon - The Imperial Confirmation (452) of the Council - Edict of Marcian and Valentinian III.

Chalcedon (451) - the Letter of the Council to Leo

 I Clement, 40 - 42, 44 about Christian Ministry at the end of the first century

Clement of Alexandria, About Himself, (Stromateis, 1. 1, 11)

Clement of Alexandria on the Ineffability of God (Stromateis, 5. 12)

Clement of Alexandria on Philosophy and Christianity (Stromateis, 5. 12)

Clement of Alexandria, Liber Quis Dives Salvetur, 11 - 17, on the Christian attitude towards riches

Codex Theodosianus - a selection of the edicts relating to Christianity and the Church from this corpus of Roman Law

Constantinople, Council of, 448 - The condemnation of Eutyches

Creed of Constantinople (Homoian - 360) Greek text with translation from Athanasius, De Synodis, 30.

Creed of the Long Lines, Ekthesis Macrostichos - 345 - Greek Text with English translation (from Athanasius and Socrates)

Creed of Nicaea in Greek and Latin - Greek text as agreed at Council of Nicaea in 325

Creed (first) of Sirmium (351), as found in Athanasius, De Synodis, Socrates, Historia Ecclesiastica and Hilary, De Synodis.

Creed (second) of Sirmium (357), as found in Athanasius, De Synodis, Socrates, Historia Ecclesiastica and Hilary, De Synodis.

Creed (fourth) of Sirmium (359), as found in Athanasius, De Synodis and Socrates, Historia Ecclesiastica.

Creed of the Western Council of Sardica (343) - Theodoret, Historia Ecclestiaca, book 2. 6 (or 8)

Cyprian Letter to Pompey about Stephen's views on the baptism of "heretics" - Epistle 73 or 74, LXXIII or LXXIV

Cyprian Letter to Quintus about the baptism of "heretics" - Epistle 70 or 71, LXX or LXXI

Cyprian on the Sacrament of the Cup of the Lord (Epistle 63 or 62 to Caecilius - LXIII or LXII)

Cyprian On the Unity of the Church

Cyril of Alexandria's Letter 39 to John of Antioch (from the year 433) - Formula of Reunion

Cyril of Alexandria Second Letter to Nestorius

Cyril of Alexandria Twelve Anathemas against Nestorius

Cyril of Jerusalem on  the significance of baptism from Mystagogica Catechesis, 1, 1-3 (Catechetical Lecture 19, XIX)

Cyril of Jerusalem on the Catholic Church from Catechetical Lecture, 18. 23 & 26

The Didache

Dio Cassius, Historia Romana, Book 67, chapter 14 - Persecution under Domitian

Dionysius of Alexandria - Defence of his Theology - Greek text from Athanasius, De Sententia Dionysii, 14 - 18

Dionysius of Rome, Against the Sabellians, Greek text from a fragment as given in Migne PL vol. 5. (from Athanasius De Decretis Nicaenae Synodi, ch. 26).

Diognetus, Epistle to - chapters 5-7

Egeria (Etheria) - Silviae Vel Potius Aetheriae Peregrinatio Ad Loca Sancta (chapter XXV - Epiphany): The Pilgrimage of Etheria

Egeria (Etheria) - Silviae Vel Potius Aetheriae Peregrinatio Ad Loca Sancta (chapters XXIX - XL - Holy Week and Easter): The Pilgrimage of Etheria

Epiphanius - Marcellus of Ancyra apologia to Pope Julius (containing the Old Roman Creed)

Epiphanius Adversus Haereses (Panarion), 62 in which the views of Sabellius and the Sabellians are described.

Eusebius of Caesarea on the Canon of the New Testament, from Historia Ecclesiastica 3.25.

Eusebius of Caesarea on the Canonical Epistles of the New Testament (Peter and Paul), from Historia Ecclesiastica 3.3.

Eusebius of Caesarea - The Edict of Milan - translation into Greek from the Latin

Eusebius of Caesarea  - Letter to Carpianus - about the Eusebian canon tables
Eusebius of Caesarea  - Letter to his Church about the Creed of Nicaea. The letter is an important witness to the text of the Creed and has given rise to discussion about the role and motives of Eusebius at Nicaea in 325. The letter is found in Socrates, Historia Ecclesiastica, 1.8.

Eusebius of Caesarea - Life of Constantine, Constantine's vision of the cross

Eusebius of Caesarea - Montanism - the Origins of, from Historia Ecclesiastica, 5.16

Eusebius of Caesarea - on Origen, from Historia Ecclesiastica, 6. 2-3

Eusebius of Caesarea - Origen's work on the Text of the Old Testament (his Hexapla), from Historia Ecclesiastica, 6.16

Eusebius of Caesarea - on Pantaenus, from Historia Ecclesiastica,  5. 10 - 11

Eusebius of Caesarea - on Papias, from Historia Ecclesiastica, 3. 39

Eusebius of Caesarea - Persecution under Nero and the martyrdom of Peter and Paul, from Historia Ecclesiastica, 2.25

Eusebius of Caesarea, Historia Ecclesiastica, 4. 3 about Quadratus and Aristides

Eusebius of Caesarea, Historia Ecclesiastica, 5. 23 - 25 about the Quartodeciman Controversy (the date for celebrating Easter)

Eusebius of Caesarea - Rain from Heaven in answer to Christian prayers, from Historia Ecclesiastica, 5.5

Eusebius of Caesarea, Historia Ecclesiastica, 4. 28 - 29 about Tatian
Eusebius of Caesarea, Historia Ecclesiastica, 5. 28. The Two Theodoti and Monarchianism

Evagrius of Pontus, Eight Logismoi (thoughts) from the Praktikos

Flavian - Apeal to Leo following the Robber Council (449)

Gregory of Nazianzus on the Deity of the Holy Spirit

Gregory of Nazianzus on The Hospital of Basil (Basileias) - Oration 43, 63

Gregory of Nazianzus Critique of Apollinaris and Apollinarianism, from letter 101 to Cledonius

Gregory of Nazianzus Letter CXXX to Procopius, in which he complains about the futility of Councils of Bishops.

Gregory of Nazianzus - Oration 1 on Easter (Oratio 1 - In sanctum Pascha et in tarditatem)

Gregory of Nazianzus on the Theophany, or Birthday of Christ. Oratio, 38 (1 - 4, 13 - 18).

Gregory of Nyssa on Baptism. In Baptismum Christi (On the Baptism of Christ) - excerpt.

Gregory of Nyssa Life of St Macrina extracts
Gregory of Nyssa - On Slavery - In Ecclesiasten Homiliae - The start of Homily IV

Gregory of Nyssa Oratio Contra Usurarios,  extracts

Gregory of Nyssa on the self-emptying of the Godhead
Gregory Thaumaturgus on Origen and Philosophy: Extracts (from 6 and 13) from The Oration and Panegyric addressed to Origen (In Origenem Oratio Panegyrica)

Hadrian Rescript to Caius

Hilary of Poitiers on The Trinity: From De Trinitate, book 12. 52 and 57

Hilary of Poitiers on The Two Natures of Christ: From De Trinitate, book 9. 14 and 10.19.

Hippolytus writing about Callistus

Hippolytus on Montanist Prophets from  Refutation of All Heresies, 8. 19.

Ignatius Letter to the Magnesians - about Christianity and Judaism (also whole letter)

Ignatius Letter to the Romans - chapter 5 about Martyrdom (also a link to complete text and translation)

Ignatius Letter to the Smyrnaeans - about Ministry and Sacraments (also whole letter)

Ignatius Letter to the Trallians - with a focus on Docetism (also whole letter)

Irenaeus about Basilides (Gnostic) from Adversus Haereses, 1.19.

Irenaeus about Ebionites from Adversus Haereses, 1.22.

Irenaeus on The Eucharist, Adversus Haereses, 4. 31

Irenaeus - the Glory of God, a living human being from Adversus Haereses, 4.34, 5-7

Irenaeus - On Humanity and the Image and Likeness of God - extracts from Adversus Haereses

Irenaeus on Tradition from Adversus Haereses, 3. 2. 1 - 3. 4. 2

Irenaeus on Marcion from Adversus Haereses, 1. 24

Irenaeus on Recapitulation in Christ from Adversus Haereses

Irenaeus "The Rule of Faith" from Adversus Haereses, 1. 2 - 3.

James, Protoevangelium of, 11 - 25

Jerome Contra Joannem Hierosolymitanum, 7. (A negative attitude towards Origen)

Jerome De Viris Illustribus, 19 - 20, on Quadratus and Aristides
Jerome De Viris Illustribus, 109, on Didymus

Jerome Fragment of Letter 33 to Paula. (A positive attitude towards Origen)

Jerome Letter 15 to Pope Damasus (about whether it is right to talk of three hypostases in the Godhead)

Jerome Letter 22 to Eustochium (section 7), about Jerome's experiences as an ascetic in the desert
Jerome Letter 22 to Eustochium (section 30), in which Jerome describes his struggle over whether he was a follower of Cicero or Christ

Jerome Letter 22 to Eustochium (sections 34-35) in which he describes the life of three kinds of Egyptian monks: Coenobites, Anchorites and Remoboth.

Jerome Letter 45 to Asella, about his departure from Rome, having faced slander, in 385.

Jerome Letter 53 to Paulinus, about the importance of scripture and how to understand it correctly

Jerome Letter 127 to Principia, about Marcella, following her death
Jerome Letter 146 to Evangelus, Deacons, Presbyters and Bishops
Jerome preface to the Four Gospels
Jerome prefaces to the Psalms
Jerome preface to the Books of Samuel and Kings (helmeted)

John of Antioch - Resolution of The Conciliabulum at Ephesus (431)

John Chrysostom - Homily on the birthday of Christ (a - There is something which long ago patriarchs painfully longed for - about date of Christmas)
John Chrysostom - Homily on the birthday of Christ (b - I see a strange and novel mystery)

John Chrysostom on free will and grace - Homily 16 on Romans 9

John Chrysostom - Homily VI on Matthew 2: 1-2, about the Magi, the star and Herod. The full homily.

John Chrysostom - Homily VII on Matthew 2, about the Magi, the star and Herod (continued..). The full homily.

John Chrysostom - Homily VIII on Matthew 2, about the Birth of Christ, The Magi, the flight into Egypt and the spiritual life of Christian women and men in the Egyptian desert. The full homily.

John Chrysostom - Homily IX on Matthew 2, about the slaughter of the innocents, the flight into Egypt, the return to Nazareth and the folly of thinking too highly of noble lineage or wealth.  The full homily.

John Chrysostom - Homily IX on Repentance

John Chrysostom - Homily XIII On The Statues to the People of Antioch (opening sections about the tribunal established by Theodosius following a riot in 387)

John Chrysostom - Homily XVII On The Statues to the People of Antioch (the intervention of the monks)

John Chrysostom - Homily XXI On The Statues to the People of Antioch (Flavian before Theodosius)

John Chrysostom - Homily XXXIV on 1 Corinthians 13: 8, about the the relationship between rich and poor.

John Chrysostom - Letter during his second exile from Constantinople appealing to to Innocent I for support (from Palladius Dialogus De Vita S. Joannis Chrysostomi.

John Chrysostom - Paschal (Easter) Sermon

Julian (Emperor) Rescript on Christian Teachers - Letter 36

Justin Martyr on the possibility of Christians before Christ

Justin Martyr on Baptism from Apology 1. 61.
Justin Martyr - Christ and Socrates - Apology 2.10

Justin Martyr on the celebration of the Eucharist and the pattern of Sunday of Worship from Apology 1. 65 - 67.

Lactantius Liber de Mortibus Persecutorum, XI - XIII. The beginning, in 303, of the great persecution under Diocletian and Galerius.

Lactantius Liber de Mortibus Persecutorum, XXXIV. The Edict of Galerius (311) - the end of the Great Persecution.

Lactantius Liber de Mortibus Persecutorum, XLIV. Constantine's heavenly vision before the battle of Milvian Bridge in 312.

Lactantius Liber de Mortibus Persecutorum, XLVIII. The Edict of Milan granting freedom of worship to Christians.

Leo - Sermon on the Festival of The Nativity VIII, (Sermon XXVIII)

Leo - The Tome of Leo - Letter 28 to Flavian - Greek and Latin Text with English translation

Libellus from the period of persecution under the emperor Decius

Lucian - The Passing of Peregrinus, chapters 11-14

Macarius (see under Pseudo-Macarius.)

Martyrdom of Polycarp

Meletius of Lycopolis - Codex Veronensis LX. Letter of Four Egyptian Bishops, A note about the Meletian Schism, Letter of Peter of Alexandria to his flock. From Routh, Reliquiae Sacrae.

Nestorius' Reply to the Second Letter of Cyril of Alexandria. (Should Mary have the title of Theotokos?)

Minucius Felix Octavius, chapters 5, 6, 8, 9 and 12

Muratorian Canon, both as found in Migne PL and in Gwatkin Selections from Early Christian Writers.

Nicene Creed in Greek and Latin - as agreed at the Council of Constantinople in 381

Novatian De Trinitate, chapter 31. The Latin text from the Fausset 1909 edition with the NPNF English translation.

Old Roman Creed - forerunner of the Apostles Creed - Greek and Latin texts

Optatus on the origins of the Donatist Controversy from De Schismate Donatistarum
Origen - Celsus' Objections Against Christianity - various extracts from Contra Celsum

Origen - The Harmony of Scripture - a fragment from The Commentary on Matthew (on Matthew 5.9) from The Philocalia

Origen On Prayer  from De Oratione, XXXI - XXXIV.
Origen, the Preface to De Principiis.

Origen from De Principiis 4. 2. 4 (in Greek) - how to understand the Scriptures - threefold understanding

Origen from De Principiis 4.16 about the Parabolic Element in Scripture.

(Palladius - see John Chrysostom above for text from Dialogus De Vita S. Joannis Chrysostomi)
Palladius - On Didymus the Blind, from Historia Lausiaca

The Passion/Martyrdom of Perpetua, Greek and Latin text

Pelagius on free will

Pelagius Letter to Demetrias, chapter 16

Pirminius, Abbas - the apostles' creed

Pliny Letter to Trajan in Latin about the treatment of Christians in Bithynia

Possidius - Sancti Augustini Vita, XXVIII, XXIX, XXXI (Life of St Augustine - the last chapters describing his final days)

Pseudo-Macarius Homily 18 on Christian perfection

Rufinus on the Apostles' Creed (Commentarius In Symbolum Apostolorum, 2)

Rufinus on the Crucifixion of Christ (Commentarius In Symbolum Apostolorum, 14 - 17)
Rufinus - Preface to the Ecclesiastical History (about his translation of Eusebius and addition of two books)
Rufinus - Preface (as found in Jerome, Letter LXXX) to his Latin translation of Origen's De Principiis

Salvian, De Gubernatione Dei, (Extracts - 3. 9; 4. 12-14; 5. 4). (On the Government of God)

Shepherd of Hermas - extracts and a link to the complete Greek text and translation

Siricius - slections from the Decretal to Himerius.

Socrates Historia Ecclesiastica, 1.6. 4 ff. The letter of Alexander and his clergy (c. 319) about the controversy surrounding Arius

Socrates' description of the start of the Arian controversy

Socrates on John Chrysostom and the statue of Eudoxia

From Socrates Historia Ecclesiastica, The Letter of the Council of Nicaea to the Egyptian Church

Socrates Historia Ecclesiastica, 1. 26 Arius' Confession of Faith to Constantine

Socrates Historia Ecclesiastica, 2. 20 about the Council of Sardica (Serdica) in 343

Socrates Historia Ecclesiastica, 6. 13, in which Socrates defends Origen against criticism.

Socrates Historia Ecclesiastica, 7, 15 about the murder of the philosopher Hypatia.

Socrates Historia Ecclesiastica, 7. 29, in which Socrates describes the appointment of Nestorius as Bishop of Constantinople

Sozomen Historia Ecclesiastica, 1. 15, in which Sozomen writes about Arius and the start of controversy.

Sozomen Historia Ecclesiastica, 2. 25, in which Sozomen writes about Athanasius and the Council of Tyre.

Sozomen Historia Ecclesiastica, 2. 27, Arius' Confession of Faith to Constantine.

Sozomen Historia Ecclesiastica, 3. 14, in which Sozomen writes about Pachomius and the monks of Egypt.

Sozomen Historia Ecclesiastica, 3. 16, in which Sozomen writes about Ephraim the Syrian.
Sulpicius Severus, Vita Martini, 3, describing how Martin shared his cloak with a poor person.

Sulpicius Severus, Vita Martini, 10, in which Martin's Monastery at Marmoutier is described.

Symmachus, Plea to Valentinian II for the restoration of the Altar of Victory in the Roman Senate. Given in Migne alongside Ambrose, Letter 17.
Synesius, Hymn 6, to Christ
Synesius, Letter 105 to his brother (about Synesius' appointment as bishop)

Tacitus Annals, 15.44, The great fire of Rome and persecution of Christians under Nero.

Tertullian passage from Apologeticus pro Christianis (Apology), 29 - 32 - about Christians and loyalty to the Emperor.
Tertullian passage from Apologeticus pro Christianis (Apology), 48 - 50 - "The Blood of Christians is Seed".

Tertullian on Crowns and Military Service - De Corona, chapters 1, 11 and 12.

Tertullian on the Incarnation from Apologeticus pro Christianis (Apology),  21: 10-14

Tertullian on Marcion from Adversus Marcionem, 1.19, 1.27, 3.8

Tertullian on Marcion from De Praescriptione Haereticorum, 30

Tertullian on philosophy and Christianity

Tertullian on Apostolic Tradition, from De Praescriptione Haereticorum,  20, 21 and 32

Tertullian on the "Rule of Faith" from Liber de Praescriptionibus adversus haereticos, ch. 13.

Tertullian on the Two Natures of Christ from Adversus Praxeam, ch. 27.

Tertullian on traditional Christian practices (Baptism and the Eucharist) from De Corona, 3

Tertullian on the Trinity from Adversus Praxeam, chapters 2 & 3

Tertullian Ad Uxorem (To His Wife) - the whole of book 1

Theodoret, Eranistes - extracts from relative to the Person of Christ

Theodoret Letter 180 to Domnus, on the death of Cyril of Alexandria

Theodore of Mopsuestia, De Incarnatione, 7

Trajan reply to Pliny in Latin about the treatment of Christians in Bithynia

Vincent of Lérins on the Catholic Faith and "Heresy"  from Commonitorium, 2. 4 - 3. 8 and 23. 54 - 58.