Identify.

Colossus of Constantine, 313 CE, Capitoline Museum, 30 ft, head 8'6" ft, abstract geometric image, eyes almost cartoonish, can tell generally what he may have looked like, proportions are off, not veristic/realism, acrolithic sculpture, seated (knee bent), possibly held a staff, other hand pointing up (reference to christian god?), 1st cleanshaven portrait of a man since Trajan