Phthia was a Mycenaean city-state in Thessaly, now in the Spercheios valley of Phthiotis, Greece. Phthia was founded by Aiakos, and his grandson Achilles ruled over Phthia at the time of the Trojan War. After the war, Achilles' son Neoptolemus came to rule over Phthia, bringing Hector of Troy's wife Andromache back to Phthia as a war slave.