First Saudi state
The first Saudi state, officially the Emirate of Diriyah, was a polity that existed on the Arabian Peninsula between 1744 and 1818. The emir of a Najdi town called Diriyah, Muhammad bin Saud Al Muqrin, and the religious leader Muhammad ibn Abd al-Wahhab signed a pact founding a socio-religious reform movement that propagated the Wahhabi religious doctrine under the political leadership of the House of Saud.
History
Early establishment
The House of Saud and its allies quickly rose to become the dominant power in Arabia by first conquering Najd, and then expanding their influence over the eastern coast from Kuwait down to the northern borders of Oman. Saud's forces also captured the highlands of Asir, while Muhammad ibn Abd al-Wahhab wrote letters to people and scholars to join the jihad. After many military campaigns, Muhammad bin Saud died in 1765, leaving the leadership to his son, Abdul-Aziz bin Muhammad, whose forces captured the Shia holy city of Karbala, in Ottoman Iraq, in 1801. Here they destroyed the shrine of the saints and monuments and killed over 5,000 civilians. In retribution, Abdulaziz was assassinated by a young Shia in 1803, having followed him back to Najd.Muhammad bin Abd al-Wahhab died in 1792. In 1803, eleven years after his death, the son of Abdulaziz bin Muhammad, Saud bin Abdulaziz, sent out forces to bring the region of Hejaz under his rule. Taif was the first city to be captured, and later the two holy cities of Mecca and Medina followed. This was seen as a major challenge to the authority of the Ottoman Empire, which had exercised its rule over the holy cities since 1517.