The attack on Karbala convinced the Ottomans and the Egyptians that the Saudis were a threat to regional peace. Abdulaziz was killed in 1803 by an assassin, believed by some to have been a Shi'ite seeking revenge over the sacking of Karbala the year before. Abdul-Aziz was in turn succeeded by his son, Saud, under whose rule the Saudi state reached its greatest extent. By the time Saud died in 1814, his son and successor Abdullah ibn Saud had to contend with an Ottoman-Egyptian invasion in the Ottoman–Wahhabi War seeking to retake lost Ottoman Empire territory. The mainly Egyptian force succeeded in defeating Abdullah's forces, taking over the Saudi capital of Diriyyah in 1818. Abdullah was taken prisoner and was soon beheaded by the Ottomans in Constantinople, putting an end to the First Saudi State. The Egyptians sent many members of the Al Saud clan and other members of the local nobility as prisoners to Egypt and Constantinople, and razed the Saudi capital Diriyyah.