The Angel of St. Matthew
Mausoleum of Galla Placidia, Ravenna, Italy
One could think of this image as an angel or as how it is described in Revelation 4:7, "an animal having a face as if of a man." (According to 4:8 all four animals are winged.)
This image in full resolution
View of the entire dome
More of St. Matthew
Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.