Ignatius of Antioch (d.108) is counted among the Apostolic Fathers, those who had direct connection to the Apostles or were taught second-hand by someone connected to them. In other words they represent the earliest testimonies of Christian leaders in the period just after the New Testament was completed (around the year 95).
Ignatius was the Bishop of Antioch, the city where the disciples were first called 'Christians' (Acts 11:26).