This document provides biographical information about Saint John the Apostle and Evangelist. It describes how he was called by Jesus along with his brother James and others to become disciples. It details John's close relationship with Jesus and his presence at key moments in Jesus' life and ministry. It discusses John's role as a leader in the early Church in Jerusalem and his authorship of the Gospel of John and letters of John in the New Testament. The document also describes John spending time in Ephesus, being exiled to the Island of Patmos where he wrote Revelation, and eventually dying in Ephesus where a church was built over his tomb.