429165 Detail from the Portrait of the Four Tetrarchs, c.300 (porphyry) by Byzantine, (4th century); St. Mark\'s Square, Venice, Italy; (add.info.: The statue depicting two Augusti and two Caesares was sacked from the Philadelphion in Constantinople and erected on the facade of St Mark\'s Basilica in Venice, Italy.); 穢Mark Edward Smith; out of copyright.