2nd Century
- Polycarp (c. 69 – c. 155)
- Papias of Hierapolis (d. c. 155?)
- Valentinus (c. 100 - c.160)
- Quadratus of Athens (fl. 124/125)
- Basilides (d. c. 132)
- Aristides the Athenian (d. c. 133 or fl. c. 140)
- Aristo of Pella (fl. c. 140)
- Marcion (c. 110 - c. 160)
- Justin Martyr (c. 110 - c. 165)
- Hegesippus (c. 110 - 180)
- Melito of Sardis (d. c. 180)
- Athenagoras of Athens (c. 133 - c. 190)
- Dionysius of Corinth (fl. c. 171)
- Heracleon (fl. c. 175)
- Apollinaris Claudius (fl. c. 177)
- Ptolemy (fl. c. 180?)
- Pantaenus (d. c. 200)
- Irenaeus of Lyons (d. c. 202)
- Apollonius of Ephesus (fl. c. 180 - c. 210)
- Serapion of Antioch (d. 211)
- Clement of Alexandria (c. 150 - 211 or 216)
- Bardaisan (154 - 222/3)
- Tertullian (c. 160 - c. 220)
Read more about this topic: List Of Christian Theologians