John the Apostle
John was the son of Zebedee, and the brother of James, together called the "sons of thunder." They originally were fishermen and fished with their father in the Lake of Genesareth. John was first a disciple of John the Baptist until he was called by Jesus to follow him. During Jesus' time on earth Peter, James, and John appeared to be part of Jesus' inner circle regularly experiencing things the other disciples did not. After Jesus' death John was one of the twelve disciples sent out as apostles.
The Gospel of John, the three letters of John and the Book of Revelation are all attributed to John the Apostle, although there is a debate as to whether or not he actually wrote them.