Definition. By Apostolic Fathers is meant a group of post canonical (and non canonical) early Christian authors, whose number has been differently; determined; according to inconsistent criteria, and, which has recently been reduced with a view to “saving and clarifying the concept” (J. A. Fischer). The decisive feature is direct contact with the apostles, or just an evident nearness; to them according to the time and content of their preaching. The reason for the fluidity of the concept of “Apo…