Odes of Solomon (early 2C CE)
Polycarp of Smyrna (c. 69 - c. 155 CE): Letter to the Philippians (second quarter 2C CE)
Epistle of Barnabas (c. 130-131 CE)
Hermas of Rome: The Shepherd (c. 139 - 155 CE)
Justin Martyr (c. 100 - c. 165): First Apology (c. 150 CE)
Irenaeus of Lyon (c.115/125 or 130/142 - c. 200/203 CE): Adversus haereses / Against heresies (2C CE)
Clement of Alexandria (c.150 - c. 215/230 CE): Writings (c. 190 - 215/230 CE)
Tertullian: Writings (c. 150 - c. 230 CE)