Ancient Greek mythology provides them with a mythical ancestor, named Thrax, son of the war-god Ares, who was said to reside in Thrace. The Thracians appear in Homer's Iliad as Trojan allies, led by Acamas and Peiros. Later in the Iliad, Rhesus, another Thracian king, makes an appearance. Cisseus, father-in-law to the Trojan elder Antenor, is also given as a Thracian king. Homeric Thrace was vaguely defined, and stretched from the River Axios in the west to the Hellespont and Black Sea in the east.
The indigenous population of Thrace was a people called the Thracians, divided into numerous tribal groups. The region was controlled by the Persian Empire at its greatest extent, and Thracian soldiers were known to be used in the Persian armies. Later on, Thracian troops were known to accompany neighboring ruler Alexander the Great when he crossed the Hellespont which abuts Thrace, and took on the Persian Empire itself.