The Custodian of the Two Holy Mosques, King Salman Bin Abdulaziz Al Saud, owns a personal library located at his residence, which was established at the beginning of his interest in reading and has grown to become one of the essential libraries in the Kingdom of Saudi Arabia. It contains 27,000 titles and 120,000 volumes, including encyclopedic books, university theses, periodicals, as well as books on literature and poetry. The personal library consists of two main halls and a third separate hall dedicated to reading and study, all made of oak wood.