Nitocris has been claimed to have been the last pharaoh of ancient Egypt's Sixth Dynasty. Her name is found in Herodotus' Histories and in writings by Manetho, but her historicity is questionable. If she was in fact a historical person, then she may have been an interregnum queen, the sister of Merenre Nemtyemsaf II and the daughter of Pepi II and Queen Neith. Alternatively, the Egyptologist and philologist Kim Ryholt has argued that Nitocris is legendary but derives from the historical male pharaoh Neitiqerty Siptah, who succeeded Merenre Nemtyemsaf II at the transition between the Old Kingdom and First Intermediate Period.