The first ruler of the First House of Saud was Muhammad bin Saud (forebear of the present rulers). He started as ruler of Ad-Dar'iyah, where he joined forces with Imam Muhammad bin Abdul Wahhab, the eminent religious leader, in what could be called the first alliance.
Muhammad bin Saud concluded an agreement with Imam Muhammad bin Abdul Wahhab that together they would bring the Arabs of the peninsula back to the true faith of the Islamic religion. They confirmed this agreement with an oath in 1744 (1157 AH).
