Among the group of early Christian writers known as the Apostolic Fathers, St Polycarp, whose feast is kept today on the traditional Roman calendar, is the one about whom we know the most. He was a disciple of St John the Evangelist, who appointed him bishop of Smyrna in Asia Minor, and the teacher of St Irenaeus of Lyon, who wrote the following about him to the Gnostic heretic Florinus.