Faisal I bin Hussein bin Ali al-Hashimi, (Arabic: فيصل بن الحسين بن علي الهاشمي‎‎, Fayṣal al-Awwal ibn al-Ḥusayn ibn ‘Alī al-Hāshimī; 20 May 1885 – 8 September 1933) was King of the Arab Kingdom of Syria or Greater Syria in 1920, and was King of Iraq from 23 August 1921 to 1933. He was a member of the Hashemite dynasty.

Faisal fostered unity between Sunni and Shiite Muslims to encourage common loyalty and promote pan-Arabism in the goal of creating an Arab state that would include Iraq, Syria and the rest of the Fertile Crescent. While in power, Faisal tried to diversify his administration by including different ethnic and religious groups in offices. However, Faisal’s attempt at pan-Arab nationalism may have contributed to the isolation of certain religious groups.

Faisal was born in Mecca, Ottoman Empire (in present-day Saudi Arabia) in 1885, the third son of Hussein bin Ali, the Grand Sharif of Mecca. He grew up in Istanbul and learned about leadership from his father. In 1913, he was elected as representative for the city of Jeddah for the Ottoman parliament.

In 1916, on a mission to Istanbul, Faisal visited Damascus twice. On one of these visits he received the , joined with the Al-Fatat group of Arab nationalists.

On 23 October 1916 at Hamra in Wadi Safra, Emir Faisal met Captain T. E. Lawrence, a junior British intelligence officer from Cairo. Lawrence, who envisioned an independent post-war Arabian state, sought the right man to lead the Hashemite forces and achieve this. In 1916–18, Faisal headed the Northern Army of the rebellion that confronted the Ottomans in what was to later become western Saudi Arabia, Jordan and Syria. In 1917, Faisal, desiring an empire for himself instead of conquering one for his father, attempted to negotiate an arrangement with the Ottomans under which he would rule the Ottoman vilayets of Syria and Mosul as an Ottoman vassal. In December 1917 Faisal contacted General Djemal Pasha declaring his willingness to defect to the Ottoman side provided they would give him an empire to rule, saying the Sykes-Picot agreement had disillusioned him in the Allies and he now wanted to work with his fellow Muslims. Only the unwillingness of the Three Pashas to subcontract ruling part of the Ottoman Empire to Faisal kept him loyal to his father when it finally dawned on him that the Ottomans were just trying to divide and conquer the Hashemite forces. In his book The Seven Pillars of Wisdom, Lawrence sought to put the best gloss on Faisal's double-dealing as it would contradict the image he was seeking to promote of Faisal as a faithful friend of the Allies betrayed by the British and the French, claiming that Faisal was only seeking to divide the "nationalist" and "Islamist" factions in the ruling Committee of Union and Progress (CUP). The Israeli historians Efraim Karsh and his wife Inari wrote that the veracity of Lawrence's account is open to question given that the major dispute within the CUP was not between the Islamist Djemal Pasha and the nationalist Mustafa Kemal as claimed by Lawrence, but rather between Enver Pasha vs. Djemal Pasha. In the spring of 1918 after Germany launched Operation Michael on 21 March 1918, which appeared for a time to foreordain the defeat of the Allies, Faisal again contacted Djemal Pasha asking for peace provided that he be allowed to rule Syria as an Ottoman vassal, which Djemal confident of victory declined to consider. After a 30-month-long siege he conquered Medina, defeating the defense organized by Fakhri Pasha and looting the city. Emir Faisal also worked with the Allies during World War I in their conquest of Greater Syria and the capture of Damascus in October 1918. Faisal became part of a new Arab government at Damascus, formed after the capture of that city in 1918. Emir Faisal's role in the Arab Revolt was described by Lawrence in Seven Pillars of Wisdom. However the accuracy of that book, not least the importance given by the author to his own contribution during the Revolt, has been criticized by some historians, including David Fromkin.

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