The apostle John was the youngest of the twelve apostles of Jesus Christ and lived longer than any other apostle. He was the brother of James the Great, and his parents were Zebedee and Salome. Jesus called the two of them "Sons of Thunder." John authored the Gospel of John, three epistles (John 1, John 2, and John 3), and the Revelation. He is sometimes known as St. John the Evangelist, St. John the Theologian, and John the Presbyter, as well as St. John of Patmos. In his Gospel, he refers to himself as "the disciple whom Jesus loved." He witnessed the raising of Jarius's daughter, the transfiguration, and the agony in Gethsemane, and he was the only apostle to remain at the feet of Jesus the entire duration of the crucifixion, and Jesus entrusted the care of His mother to John.
John was imprisoned on the island of Patmos when he wrote the Revelation, the last book of the bible which was told to him by the Holy Spirit. He personally trained Polycarp, who became the Bishop of Smyrna, who carried the Message to another age.