Soldiers of the Achaemenid army of Xerxes at the time of the Battle of Thermopylae. Tomb of Xerxes, circa 480 BC, Naqsh-e Rustam. Top rank: Persian, Median, Elamite, Parthian, Arian, Bactrian, Sogdian, Chorasmian, Zarangian, Sattagydian, Gandharan, Hindush (Indians), Scythian. Bottom rank: Scythian, Babylonian, Assyrian, Arabian, Egyptian, Armenian, Cappadocian, Lydian, Ionian, Scythian, Thracian, Macedonian, Libyan, Ethiopian.