Named after the Egyptian pharaoh Sethos I (reigned 1304–1290 B.C.) of the 19th dynasty. His father was Ramses I, who reigned for only two years. Sethos I built the Great Hall of Columns of the Amun {see planet  (3554)} temple in Karnak and the Osiris {see planet  (1923)} temple in Abydos. Sethos I was the father of Ramses II {see planet  (4416)}. (M 22505) _ _.