Tutankhamun took the throne at eight or nine years of age under the unprecedented viziership of his eventual successor Tutankhamun who was the last of his royal family to rule during the end of the 18th Dynasty (ruled c. 1332 – 1323 BC in the conventional chronology) during the New Kingdom of Egyptian history. His father was the mummy found in the tomb KV55, believed to be the pharaoh Akhenaten. His mother is his father's sister, identified through DNA testing as an unknown mummy referred to as "The Younger Lady" who was found in KV35.[8]