Papias was a Greek Apostolic Father, Bishop of Hierapolis, and author who lived c. 60 – c. 130 AD He wrote the Exposition of the Sayings of the Lord in five books. This work, which is lost apart from brief excerpts in the works of Irenaeus of Lyons and Eusebius of Caesarea, is an important early source on Christian oral tradition and especially on the origins of the canonical Gospels.

The Apostolic Fathers, also known as the Ante-Nicene Fathers, were core Christian theologians among the Church Fathers who lived in the 1st and 2nd centuries AD who are believed to have personally known some of the Twelve Apostles or to have been significantly influenced by them. Their writings, though widely circulated in early Christianity, were not included in the canon of the New Testament. Many of the writings derive from the same time period and geographical location as other works of early Christian literature which came to be part of the New Testament.