San Giovanni Evangelista, or Saint John the Evangelist, is one of the twelve apostles of Jesus Christ and is traditionally credited with writing the Gospel of John, three epistles, and the Book of Revelation. He is often depicted as a young man and is recognized as the patron saint of authors, theologians, and bookbinders. In Christian art, San Giovanni Evangelista is frequently represented with symbols such as an eagle, which signifies the heights of divinity. His feast day is celebrated on December 27, and he is revered in various Christian denominations, including Catholicism and Orthodoxy.