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St Clement of Rome. Clement, third successor to St. Peter as Bishop of Rome, "had seen the blessed Apostles [Peter and Paul] and had been conversant with them" (Irenaeus, Adversus Haereses, III, iii, 3).
St Ignatius of Antioch. Ignatius was the second successor of St. Peter in the See of Antioch (Eusebius, Hist. Eccl., III, 36) and during his life in that centre of Christian activity may have met with others of the Apostolic band. An accepted tradition, substantiated by the similarity of Ignatius's thought with the ideas of the Johannine writings, declares him a disciple of St. John.
St Polycarp of Smyrna, of whose intimate personal relations with the Apostles there is the strongest Church tradition. Polycarp was "instructed by Apostles" (Irenaeus, op. cit., III, iii, 4) and had been a disciple of St. John (Eusebius, op. cit., III, 36; V, 20) whose contemporary he was for nearly twenty years.