Abdullah bin Saud (Arabic: عبد الله بن سعود) (died 1818) ruled the First Saudi State from 1814 to 1818. He was the last ruler of the First Saudi State and was executed by the Ottomans. Although the Ottomans maintained several garrisons in Najd thereafter, they were unable to prevent the rise of the Second Saudi State from another branch of the House of Saud under Turki bin Abdallah bin Muhammad bin Saud.
Read more about Abdullah Bin Saud: Fall of The First Saudi State, Reasons For His Execution