Abdulaziz ibn Abdul Rahman ibn Faisal ibn Turki ibn Abdullah ibn Muhammad Al Saud ( , ; 15 January 1876 -- 9 November 1953 ) , usually known within the Arab world as Abdulaziz and usually known outside it as Ibn Saud , was the first monarch and founder of Saudi Arabia , the third Saudi State .
Abdulaziz ibn Saud ( 15 January 1876 -- 9 November 1953 ) , was the founder and first monarch of Saudi Arabia . He was usually known in the Arab world as Abdulaziz and known outside it as Ibn Saud .