One of the four evangelists, Luke is said to be the first icon painter and the artist who painted pictures of Mary and the infant Jesus. His symbol is the ox, an image taken from the vision of the four living creatures who draw God’s chariot in Ezekiel 1 and Rev. 4: 6b-11. You can see a portrait of the Virgin Mary in his arms here, and the image of the ox. Luke was also a physician, and the caduceus appears on the right side of the window.