Saint Andrew the Apostle

Saint Andrew was one of Jesus' twelve apostles, and the brother of Saint Peter. He is known as the "first-called", because the Gospel of John suggests he was one of the first to follow Jesus. After the Resurrection and Pentecost, Saint Andrew spread the gospel in Eastern Europe. Most significantly, he is believed to have founded the church at Byzantium. Thus the Archbishop of Constantinople, head of the Eastern Orthodox church, is considered to be a successor of Saint Andrew.