John the Apostle was one of the twelve disciples of Jesus Christ and is often referred to as the "beloved disciple." He is traditionally credited with writing the Gospel of John, three letters known as the Epistles of John, and the Book of Revelation. John is believed to have been the son of Zebedee and the brother of James. John played a significant role in the early Christian community and is known for his close relationship with Jesus. He witnessed many key events in Jesus' life, including the Transfiguration and the Crucifixion. According to tradition, John lived to an old age and died in Ephesus.