The Parts of the World in which the Apostles preached Christ
1 Such was the condition of the Jews. Meanwhile the holy apostles and disciples of our Saviour were dispersed throughout the world. Parthia, according to tradition, was allotted to Thomas as his field of labor, Scythia to Andrew, and Asia to John, who, after he had lived some time there, died at Ephesus.
2. Peter appears to have preached in Pontus, Galatia, Bithynia, Cappadocia, and Asia to the Jews of the dispersion. And at last, having come to Rome, he was crucified head-downwards; for he had requested that he might suffer in this way. What do we need to say concerning Paul, who preached the Gospel of Christ from Jerusalem to Illyricum, and afterwards suffered martyrdom in Rome under Nero? These facts are related by Origen in the third volume of his Commentary on Genesis.
Source: Church History (New Advent)