At the time of the Trojan War, the Epirotes (Molossians, Thesprotians and Chaonians) were not considered Hellenes, for the people so named were then limited to a small tribe in Thessaly of which Achilles was a member. After the name was extended to all peoples south of Mount Olympus, however, it still left out those of common origin living in the north. One factor contributing to this was their non-participation in the Persian Wars, which were considered a vital affair for all Hellenes; subsequent to the Persian Wars, representatives of these tribes were accepted in the Olympic Games and competed alongside other Hellenes. The fact that each of these northern peoples at this time continued to live as an ethnos, or collection of tribes, under an archaic monarchial political system - as opposed to the democratic or oligarchic polis (city state) of the south-also contributed to this view of them as barbaric.