The origins of the 20th Dynasty remain obscure, their only indications being provided by the Elephantine Stela. After several years of political and social unrest, Sethnakhte seized power as first king of the 20th Dynasty. He was succeeded by his son Ramesses III, who is considered to be the last great king of the New Kingdom. His reign is marked by a long list of achievements, including an impressive building program, military successes, and a number of expeditions.