The Alexander Mosaic

This is the very famous Alexande Mosaic, found in Casa del Fauno in Pompeii (It was therefore made before 79 Ad). The mosaic we have preserved here is not from the 4th century Bc but it's generally accepted that the motif is a copy of a much older frescoes. This would then be one of few remaining 4th century paintings and the motif is typical - Alexander at the Battle of Issos.