The inventor is believed to be the Thessalian ruler Jason of Pherae.
[2] Plutarch records that hemithorakia were worn by Pelopidas and his soldiers during the battle to expel the Spartans from Thebes in 379, a battle in which Pelopidas and his men disguised themselves as women.
In art, it is generally seen on female warriors, which corroborates Plutarch's account.
Instances in art include several vase depictions on Amazons.
An unusual intact terracotta mold from Morgantina, dating from the first half of the fourth century, shows Artemis wearing the hemithorakia while sacrificing a hind.