Tjahapimu most likely was a son of pharaoh Nectanebo I and thus a brother of pharaoh Teos,[2][3][4] though he is sometimes rather reported as a brother of Nectanebo I and an uncle of Teos.[1] When Teos went to the Near East leading a military expedition against the Achaemenid Empire, he left Tjahapimu in Egypt as his regent.[2] However, Tjahapimu took advantage of Teos' unpopularity in Egypt, which was due to the harsh tax regime that the pharaoh imposed in order to finance his expedition. Tjahapimu convinced his own son Nakhthorheb, who was serving Teos as the commander of the machimoi, to rebel against him and to rise as pharaoh himself. His plan was successful: Nakhthorheb (Nectanebo II) was acclaimed pharaoh and Teos fled at Susa to the court of the Great King.[2][3]