Abdulaziz bin Abdul Rahman Al Saud, known in the West as Ibn Saud, was an Arab tribal, political, and religious leader who founded Saudi Arabia, the third Saudi state. He reigned as the first king of Saudi Arabia from 23 September 1932 to his death in 1953. He had ruled parts of the kingdom since 1902, having previously been Emir, Sultan, and King of Nejd, and King of Hejaz.