Demophon was a king of Athens, according to Pindar, son of Theseus and Phaedra, brother of Acamas. Some say that Demophon's mother was Iope, daughter of Iphicles. He fought in the Trojan War and was among those who entered the city in the Trojan Horse. The brothers freed their grandmother Aethra, who had been captured by the Dioscuri and served Helen as a handmaid for a while, and brought her home.