Saint John was one of the twelve apostles and, according to tradition, the author of the fourth Gospel, the three epistles which bear his name, and the Book of Revelation.
He is regarded as the “beloved disciple” in the Gospel accounts, and was a member of the “inner three” disciples, the other two being Peter and James.
John is also the only one of the disciples who stood at the cross of Christ during the Crucifixion.
Because of the intimacy he had with Jesus, his gospel account gives us much in regards to revealing the heart and mind of Our Lord, and is filled with symbolism, as is Revelation, also.
John was also the last of the apostles to die, having lived a long life on the isle of Patmos.