Evangelists. In Christian tradition, the Four Evangelists are Matthew, Mark, Luke, and John, the authors attributed with the creation of the four Gospel accounts in the New Testament that bear the following titles: Gospel according to Matthew; Gospel according to Mark; Gospel according to Luke and Gospel according to John. The gospels of Matthew, Mark, and Luke are known as the Synoptic Gospels, because they include many of the same stories, often in the same sequence. While the periods to which the gospels are usually dated suggest otherwise, convention traditionally holds that the authors were two of the Twelve Apostles of Jesus, John and Matthew, as well as two apostolic men, Mark and Luke: Matthew-a former tax collector who was called by Jesus to be one of the Twelve Apostles. Mark-a follower of Peter and so an apostolic man,. Luke-a doctor who wrote what is now the book of Luke to Theophilus. Also known to have written the book of Acts and to have been a close friend of Paul of Tarsus. John-a disciple of Jesus and the youngest of his Twelve Apostles. They are called evangelists, a word meaning people who proclaim good news, because their books aim to tell the good news of Jesus. In iconography, the evangelists often appear in Evangelist portraits derived from classical tradition, and are also frequently represented by the symbols which originate from the four living creatures that draw the throne-chariot of God, the Merkabah, in the vision in the Book of Ezekiel reflected in the Book of Revelation, though neither source links the creatures to the Evangelists. Images normally, but not invariably, appear with wings like angels. When the symbols of the Four Evangelists appear together, it is called a Tetramorph, and is common in the Romanesque art of Europe, in church frescoes or mural paintings, for instance. The meanings accruing to the symbols grew over centuries, with an early formulation by Jerome, and were fully expressed by Rabanus Maurus, who set out three layers of meaning for the beasts, as representing firstly the Evangelists, secondly the nature of Christ, and thirdly the virtues required of a Christian for salvation: These animals may have originally been seen as representing the highest forms of the various types of animals, i.e., man, the king of creation as the image of the creator; the lion as the king of beasts of prey; the ox as the king of domesticated animals and the eagle as the king of the birds. Matthew the Evangelist, the author of the first gospel account, is symbolized by a winged man, or angel. Matthew's gospel starts with Joseph's genealogy from Abraham; it represents Jesus' Incarnation, and so Christ's human nature. This signifies that Christians should use their reason for salvation. Mark the Evangelist, the author of the second gospel account, is symbolized by a winged lion-a figure of courage and monarchy. The lion also represents Jesus' resurrection, and Christ as king. This signifies that Christians should be courageous on the path of salvation. Luke the Evangelist, the author of the third gospel account, is symbolized by a winged ox or bull-a figure of sacrifice, service and strength. Luke's account begins with the duties of Zechariah in the temple; it represents Jesus's sacrifice in His Passion and Crucifixion, as well as Christ being High priest. The ox signifies that Christians should be prepared to sacrifice themselves in following Christ. John the Evangelist, the author of the fourth gospel account, is symbolized by an eagle-a figure of the sky, and believed by Christian scholars to be able to look straight into the sun. John starts with an eternal overview of Jesus the Logos and goes on to describe many things with a higher christology than the other three gospels; it represents Jesus's Ascension, and Christ's divine nature. This symbolizes that Christians should look on eternity without flinching as they journey towards their goal of union with God. Each of the symbols is depicted with wings, following the biblical sources first in Ezekiel 1-2, and in Revelation. The symbols are shown with, or in place of, the Evangelists in early medieval Gospel Books, and are the usual accompaniment to Christ in Majesty when portrayed during the same period, reflecting the vision in Revelation. They were presented as one of the most common motifs found on church portals and apses, as well as many other locations. When surrounding Christ, the figure of the man usually appears at top left-above Christ's right hand, with the lion above Christ's left arm. Underneath the man is the ox and underneath the lion is the eagle.