The valley

Diriyah (Arabic: الدرعية‎), formerly romanized as Dereyeh and Dariyya, is a town in Saudi Arabia located on the north-western outskirts of the Saudi capital, Riyadh. Diriyah was the original home of the Saudi royal family, and served as the capital of the Emirate of Diriyah under the first Saudi dynasty from 1744 to 1818.

The Emirate of Diriyah was the first Saudi state. It was established in the year 1744 (1157 AH) when Muhammad ibn Abd al-Wahhab and Prince Muhammad bin Saud formed an alliance to found a socio-religious reform movement to unify the many states of the Arabian Peninsula and free it from Ottoman rule. In 1744, both Muhammed bin Abd Al Wahhab and Muhammad bin Saud took an oath to achieve their goal.