The House of Saud ( Āl Saʻūd) is the ruling royal family of Saudi Arabia. The family has thousands of members. It is composed of the descendants of Muhammad bin Saud, founder of the Emirate of Diriyah, known as the First Saudi state (1818–91), and his brothers, though the ruling faction of the family is primarily led by the descendants of Ibn Saud, the modern founder of Saudi Arabia.