Now the designation of the apostles of our Saviour is clear to everyone from the gospels; but of the seventy disciples no list is anywhere preserved. It is said, however, that Barnabas was one of them, of whom the Acts of the Apostles has made mention in various places, and not least Paul too when writing to the Galatians. They say that Sosthenes also, who wrote together with Paul to the Corinthians, was one of these.
There is also the account in Clement, in the fifth book of the Hypotyposes, in which he says that Cephas, concerning whom Paul says, "But when Cephas came to Antioch, I withstood him to his face," was one of the seventy disciples, a man bearing the same name as Peter the apostle.
And tradition holds that Matthias too, who was numbered with the apostles in the place of Judas, as well as the one who was honoured with him by the like casting of lots, had been counted worthy of the same calling among the seventy. They say also that Thaddaeus was one of these, concerning whom I shall presently set forth an account that has come down to us.
And upon examination you would find that there were more disciples of the Saviour than the seventy, using Paul as a witness, who declares that after the resurrection from the dead Jesus was seen first by Cephas, then by the twelve, and after these by more than five hundred brethren at once, of whom, he said, some had fallen asleep, but the greater number remained alive at the time when he composed this account.
Then, he says, Jesus was seen by James, and this man too was one of those reckoned as brethren of the Saviour. Then, as though besides these there had been a great many other apostles after the pattern of the twelve, such as Paul himself was, he adds, saying, "Then he was seen by all the apostles." So much, then, concerning these. But the account concerning Thaddaeus came about in this manner.