The Ox of Saint Luke

5th century
Mosaic
Mausoleum of Galla Placidia, Ravenna, Italy

Symbols of the evangelists are placed at the four corners of the dome support. The winged ox is St. Luke's symbol because of the beasts around th ethrone in Revelation 4:7, "And the first living creature was like a lion: and the second living creature like a calf [vitulo in the Latin Vulgate]: and the third living creature, having the face, as it were, of a man: and the fourth living creature was like an eagle flying."

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Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.