 Djedkare Isesi ( known in Greek as Tancherês ) was an Ancient Egyptian pharaoh , the eighth and penultimate ruler of the Fifth Dynasty in the late 25th century to mid 24th century BCE , during the Old Kingdom period . Djedkare succeeded Menkauhor Kaiu and was in turn succeeded by Unas . His relations to both of these pharaohs remain uncertain , although it is often conjectured that Unas was Djedkare 's son owing to the smooth transition between the two . 
