The Ottoman Arab uprisings took place by Hussein bin Ali Al-Hashimi and his supporters. Hussein was a statesman who was born in Istanbul and received his court education and was later appointed as sheriff of Mecca, by Abdulhamit, the ottoman sultan and caliph. (The Mecca was traditionally ruled by sheriffs, descendants of Hasan bin Ali, the grandson of the beloved Prophet (s.a.v). Ottomans took control of region in 1517, but always respected the sheriffs' autonomy.)
While the Turks were fighting against Russia, British and French for the Islamic caliphate, Sharif Hussein argued that the Turks had betrayed Islam. Then formed an alliance with the British.
Sharif Hussein's idea of revolt became clear after his son Emir Abdullah's talks with British officials in Cairo in Egypt in the first week of February 1914. Sharif Hussein made his first offer to the British on July 2, 1915, and informed by a private letter that if the Arabs south of the line to be drawn from Mersin and Adana to Mosul were allowed to form as an independent government, he would revolt against the Islamic Caliph he was subject. The Sheriff Hussein-British talks finally ended with a mutual agreement on March 10, 1916. In the period until 6 November 1916, Şerif Hüseyin received a payment of 773 thousand Pounds.
After the Franco-British alliance achieve their goals, land promised to Sharif Hussein did not given, and even they declared a Jewish settlement by Balfour Declaration.
Hussein did not accept these mandate states and declared himself the king of all Arabs. He even declared himself Caliph in 1924. His relationship with the British suffered greatly because he did not accept the Treaty of Versailles. Meanwhile, he faced Saudi and Wahhabi attacks supported by the British.
After a while, he was captured in Taif by the Ihvan, supported by the Saudis, and exiled by the British to the island of Cyprus. For a few years laters he moved to Jordan, where his son was king, and died there.
TL;DR No betrayal ends with a happy ending.