The New Testament records that St Andrew was a son of Jonah, or John. He was born in Bethsaida on the Sea of Galilee. Both he and his brother Peter were fishermen by trade, hence the tradition that Jesus called them to be his disciples by saying that He will make them "fishers of men." At the beginning of Jesus' public life they occupied the same house at Capernaum. The Gospel of John teaches that Andrew was a disciple of John the Baptist, whose testimony first led him and John the Evangelist to follow Jesus. Andrew at once recognized Jesus as the Messiah, and hastened to introduce him to his brother. Thenceforth the two brothers were disciples of Christ. On a subsequent occasion, prior to the final call to the apostolate, they were called to a closer companionship, and then they left all things to follow Jesus. In the gospels Andrew is referred to as being present on some important occasions as one of the disciples more closely attached to Jesus, but in Acts there is only a bare mention of him. Andrew is said to have been martyred by crucifixion at Patras (Patrae) in Achaea. Though early texts, such as the Acts of Andrew known to Gregory of Tours, describe Andrew bound, not nailed, to a Latin cross of the kind on which Christ was crucified, a tradition grew up that Andrew had been crucified on a cross of the form called Crux decussata (X-shaped cross) and commonly known as "St. Andrew's cross"; this was performed at his own request, as he deemed himself unworthy to be crucified on the same type of cross on which Christ was crucified. "The familiar iconography of his martyrdom, showing the apostle bound to an X-shaped cross, does not seem to have been standardized before the later Middle Ages," Judith Calvert concluded after re-examining the materials studied by Louis Rau.