John the Apostle was one of the Twelve Apostles of Jesus, alongside his brother James, according to the New Testament. He is believed to be the youngest of the apostles and the only apostle who died of old age rather than being martyred. He is also known as John the Evangelist, the Beloved Disciple, John of Patmos, John the Elder and John the Presbyter. He is believed to be the author of the 'Gospel of John', as well as four other books of the New Testament: the three 'Epistles of John' and the 'Book of Revelation'. Some sources also credit him for writing the pseudepigraphal apocryphal text of titled 'Acts of John' which, despite containing strong docetic themes, is not considered to be gnostic in modern scholarship. December 27 is observed as the feast day of Saint John.