Abdulaziz 15 January 1875 – 9 November 1953, usually known within the Arab world as Abdulaziz and in the West as Ibn Saud, was the first monarch and founder of Saudi Arabia, the "third Saudi state".
He reconquered his family's ancestral home city of Riyadh in 1902, starting three decades of conquests that made him the ruler of nearly all of central Arabia. He consolidated his control over the Najd in 1922, then conquered the Hejaz in 1925. He extended his dominions into what later became the Kingdom of Saudi Arabia in 1932. As King, he presided over the discovery of petroleum in Saudi Arabia in 1938 and the beginning of large-scale oil production after World War II. He fathered many children, including 45 sons, and all of the subsequent kings of Saudi Arabia.