Citadel of Damascus
During this time Nur ad-Din was busy in the north, fighting the Ortoqids, and in 1170 he had to settle a dispute between his nephews when his brother Qutb ad-Din died. After conquering Egypt, Nur ad-Din believed that he had accomplished his goal of uniting the Muslim states, he was seized by a fever due to complications from a peritonsillar abscess. He died at the age of 56 on 15 May 1174 in the Citadel of Damascus. He was initially buried there, before being reburied in the Nur al-Din Madrasa. His young son As-Salih Ismail al-Malik became his legitimate heir, and Saladin declared himself his vassal, Syria and Egypt under his own rule. defeated the other claimants to the throne and took power in Syria in 1185, finally realizing Nur ad-Din's dream.