The Four Gospel Writers

Another common Christian symbol that you may find in Catholic churches are these four:
      
A man, a lion, an ox, and an eagle - these represent the four Gospel writers, Matthew, Mark, Luke, and John.  Christian tradition has long associated the Gospel writers with the four "living creatures" that surround the throne of God in Revelation 4:7.  Matthew is represented by the man, Mark the lion, Luke the ox, and John the eagle, which reflect the style and content of their particular Gospel.