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The Ottoman dynasty embodied the Ottoman Caliphate since the fourteenth century, starting with the reign of Murad I. The head of the Ottoman family kept the title caliph, power over all Muslims, as Mehmed's cousin Abdülmecid II took the title. The Ottoman dynasty was left as a political-religious successor to Muhammad and a leader of the entire Muslim community without borders in a post Ottoman Empire. Abdülmecid II's title was challenged in 1916 by the leader of the Arab Revolt King Hussein bin Ali of Hejaz, who denounced Mehmet V, but his kingdom was defeated and annexed by Ibn Saud in 1925.