Dome of the Mausoleum of Galla Placidia: Detail, the eagle of St. John

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

Symbols of the evangelists are placed at the four corners of the dome support. In this one, St. John is as usual represented by an eagle.

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