It's St. Luke the Evangelist on his symbolic Winged Ox! I actually visited his tomb in Padua before my first vows awhile back. And I saw his painting of the Blessed Virgin Mary in Bologna. He is definately the Evangelist I am most devoted to because he is the patron of Artists! He is also a physician and because my religious name Raphael means "God Heals" and the Divine Physician there is also that connection. St. Luke Physician, Artist and Evangelist, pray for us! ^_^