In Homer's Iliad, Thersander was one of the Epigonoi, a son of Polynices. He intended on fighting for the Greeks during the Trojan War but he was killed by Telephus before the war began, while the Greeks had mistakenly stopped in Mysia.
Thersander 1, son of Polynices and Argia 1 (daughter of Adrastus 1), was determined to sit on the throne he believed should have belonged to his father, by deposing his cousin Laodamas 2, son of Eteocles 1, now king of Thebes.
Thersander 1, son of Polynices, married Amphiaraus' daughter Demonassa 4, and had by her a son Tisamenus 1, who in time became king of Thebes.
Some say that Thersander 1 was killed by Telephus, son of Heracles 1, when the Achaean fleet, sailing against Troy, arrived by mistake in Mysia.