Orsippus

Orsippus (Greek: Ὄρσιππος) was a Greek runner from Megara who was famed as the first to run the footrace naked at the Olympic Games and "first of all Greeks to be crowned victor naked."[1][2] Others argue that it was Acanthus instead who first introduced Greek athletic nudity. Orsippus won the stadion-race of the 15th Olympic Games in 720 BC.