(detail) The Alexander Mosaic
Ancient, Roman
(detail) The Alexander Mosaic
(detail) The Alexander Mosaic, c. 100 B.C. (artist unknown). Roman floor mosaic, 272 x 513 cm (8 ft 11 inches × 16 ft 9 inches). Originally located in the House of the Faun in Pompeii. National Archaeological Museum, Naples, Italy.

"The mosaic is believed to be copy of an early 3rd Century BC Hellenistic painting,[2] possibly by Philoxenos of Eretria ...

The portrait of Alexander is one of his most famous. Alexander's breastplate depicts Medusa, the famous Gorgon, and his wavy hair is typical of royal portraiture as established in Greek art of the fourth century B.C. He is portrayed sweeping into battle at the left, on his famous horse, Bucephalos, and focusing his gaze on the Persian leader."

Read more: http://en.wikipedia.org/wiki/Alexander_Mosaic