section_path: History/Saud dynasty and unification
section_name: Saud dynasty and unification
paragraph_text: Saud dynasty and unification
  
  The emergence of what was to become the Saudi royal family, known as the Al Saud, began at the town of Diriyah in Nejd in central Arabia with the accession as emir of Muhammad bin Saud on 22 February 1727. In 1744 he joined forces with the religious leader Muhammad ibn Abd al-Wahhab, founder of the Wahhabi movement, a strict puritanical form of Sunni Islam. This alliance provided the ideological impetus to Saudi expansion and remains the basis of Saudi Arabian dynastic rule today.
  
  The Emirate of Diriyah established in the area around Riyadh rapidly expanded and briefly controlled most of the present-day territory of Saudi Arabia, sacking Karbala in 1802, and capturing Mecca in 1803. In 1818, it was destroyed by the Ottoman viceroy of Egypt, Mohammed Ali Pasha. The much smaller Emirate of Nejd was established in 1824. Throughout the rest of the 19th century, the Al Saud contested control of the interior of what was to become Saudi Arabia with another Arabian ruling family, the Al Rashid, who ruled the Emirate of Jabal Shammar. By 1891, the Al Rashid were victorious and the Al Saud were driven into exile in Kuwait.
  
  At the beginning of the 20th century, the Ottoman Empire continued to control or have a suzerainty over most of the peninsula. Subject to this suzerainty, Arabia was ruled by a patchwork of tribal rulers, with the Sharif of Mecca having pre-eminence and ruling the Hejaz. In 1902, Abdul Rahman 's son, Abdul Aziz—later known as Ibn Saud —recaptured control of Riyadh bringing the Al Saud back to Nejd, creating the third "Saudi state". Ibn Saud gained the support of the Ikhwan, a tribal army inspired by Wahhabism and led by Faisal Al-Dawish, and which had grown quickly after its foundation in 1912. With the aid of the Ikhwan, Ibn Saud captured Al-Ahsa from the Ottomans in 1913.
  
  In 1916, with the encouragement and support of Britain (which was fighting the Ottomans in World War I), the Sharif of Mecca, Hussein bin Ali, led a pan- Arab Revolt against the Ottoman Empire to create a united Arab state. Although the revolt failed in its objective, the Allied victory in World War I resulted in the end of Ottoman suzerainty and control in Arabia, and Hussein bin Ali became King of Hejaz.
  
  Ibn Saud avoided involvement in the Arab Revolt and instead continued his struggle with the Al Rashid. Following the latter's final defeat, he took the title Sultan of Nejd in 1921. With the help of the Ikhwan, the Kingdom of Hejaz was conquered in 1924–25, and on 10 January 1926, Ibn Saud declared himself king of Hejaz. For the next five years, he administered the two parts of his dual kingdom as separate units.
  
  After the conquest of the Hejaz, the Ikhwan leadership's objective switched to expansion of the Wahhabist realm into the British protectorates of Transjordan, Iraq and Kuwait, and began raiding those territories. This met with Ibn Saud's opposition, as he recognized the danger of a direct conflict with the British. At the same time, the Ikhwan became disenchanted with Ibn Saud's domestic policies which appeared to favour modernization and the increase in the number of non-Muslim foreigners in the country. As a result, they turned against Ibn Saud and, after a two-year struggle, were defeated in 1929 at the Battle of Sabilla, where their leaders were massacred. On Ibn Saud's behalf, Prince Faisal declared the unification on 23 September 1932, and the two kingdoms of Hejaz and Nejd were unified as the Kingdom of Saudi Arabia. That date is now a national holiday called Saudi National Day.