In Egyptian mythology, Osiris was the son of Geb, the brother and husband of Isis, and the father of Horus. After he was killed by his brother Set, Isis buried him on the island of Philae in the upper Nile. He then became king of the underworld. The island became the location of a whole complex of temples, built over a period of about 500 years, and a center for devotion to Isis and Osiris, among other deities. One of the largest structures is Trajan's Kiosk, built perhaps as a resting place for Isis' boat. In the 1960's the construction of the Aswan High Dam threatened to flood the island, so all of the ruins were carefully moved to a site on higher ground at Agilkia Island.