The Early Fathers may be conveniently classed, according to the colour of their testimony, the locality where they flourished, and the age in which they severally lived, under five heads, viz., Early Traditional, Later Traditional, Syrio-Low Latin, Alexandrian, and what we may perhaps call Caesarean.
I. Early Traditional.
| Traditional. | Neologian. | |
| Patres Apostolici and Didachè | 11 | 4 |
| Epistle to Diognetus | 1 | 0 |
| Papias | 1 | 0 |
| Epistola Viennensium et Lugdunensium | 1 | 0 |
| Hegesippus | 2 | 0 |
| Seniores apud Irenaeum | 2 | 0 |
| Justin[143] | 17 | 20 |
| Athenagoras | 3 | 1 |
| Gospel of Peter | 2 | 0 |
| Testament of Abraham | 4 | 0 |
| Irenaeus | 63 | 41 |
| Clementines | 18 | 7 |
| Hippolytus | 26 | 11 |
| —— | —— | |
| 151 | 84 |
II. Later Traditional.
| Traditional. | Neologian. | |
| Gregory Thaumaturgus | 11 | 3 |
| Cornelius | 4 | 1 |
| Synodical Letter | 1 | 2 |
| Archelaus (Manes) | 11 | 2 |
| Apostolic Constitutions and Canons | 61 | 28 |
| Synodus Antiochena | 3 | 1 |
| Concilia Carthaginiensia | 8 | 4 |
| Methodius | 14 | 8 |
| Alexander Alexandrinus | 4 | 0 |
| Theodorus Heracleensis | 2 | 0 |
| Titus of Bostra | 44 | 24 |
| Athanasius(—except Contra Arianos)[144]122 | 63 | |
| Serapion | 5 | 1 |
| Basil | 272 | 105 |
| Eunomius | 1 | 0 |
| Cyril of Jerusalem | 54 | 32 |
| Firmicus Maternus | 3 | 1 |
| Victorinus of Pettau | 4 | 3 |
| Gregory of Nazianzus | 18 | 4 |
| Hilary of Poictiers | 73 | 39 |
| Eustathius | 7 | 2 |
| Macarius Aegyptius or Magnus | 36 | 17 |
| Didymus | 81 | 36 |
| Victorinus Afer | 14 | 14 |
| Gregory of Nyssa | 91 | 28 |
| Faustinus | 4 | 0 |
| Optatus | 10 | 3 |
| Pacianus | 2 | 2 |
| Philastrius | 7 | 6 |
| Amphilochius (Iconium) | 27 | 10 |
| Ambrose | 169 | 77 |
| Diodorus of Tarsus | 1 | 0 |
| Epiphanius | 123 | 78 |
| Acta Pilati | 5 | 1 |
| Acta Philippi | 2 | 1 |
| Macarius Magnes | 11 | 5 |
| Quaestiones ex Utroque Testamento | 13 | 6 |
| Evagrius Ponticus | 4 | 0 |
| Esaias Abbas | 1 | 0 |
| Philo of Carpasus | 9 | 2 |
| —— | —— | |
| 1332 | 609 |
III. Western or Syrio-Low Latin.
| Traditional. | Neologian. | |
| Theophilus Antiochenus | 2 | 4 |
| Callixtus and Pontianus (Popes) | 1 | 2 |
| Tertullian | 74 | 65 |
| Novatian | 6 | 4 |
| Cyprian | 100 | 96 |
| Zeno, Bishop of Verona | 3 | 5 |
| Lucifer of Cagliari | 17 | 20 |
| Lactantius | 0 | 1 |
| Juvencus (Spain) | 1 | 2 |
| Julius (Pope)? | 1 | 2 |
| Candidus Arianus | 0 | 1 |
| Nemesius (Emesa) | 0 | 1 |
| —— | —— | |
| 205 | 203 |
IV. Alexandrian.
| Traditional. | Neologian. | |
| Heracleon | 1 | 7 |
| Clement of Alexandria | 82 | 72 |
| Dionysius of Alexandria | 12 | 5 |
| Theognostus | 0 | 1 |
| Peter of Alexandria | 7 | 8 |
| Arius | 2 | 1 |
| Athanasius (Orat. c. Arianos) | 57 | 56 |
| —— | —— | |
| 161 | 150 |
V. Palestinian or Caesarean.