Taharka (təhär´kə) or Tirhakah (tēr´əkə, tērhä´kə), d. 663 BC, king of ancient Egypt, last ruler of the XXV dynasty; son of Piankhi. Before he was king, he led the Egyptians against Sennacherib, who disastrously defeated him. Seizing (688 BC) the throne by force, Taharka established a residence at Tanis. In 671 he lost Memphis and Lower Egypt to the Assyrians under Esar-Haddon. On the withdrawal of the Assyrians, Taharka again entered Lower Egypt, only to be expelled (667) by Assurbanipal. He restored the temples at Napata.