Shortly after the Turkish abolition decree, Hussein bin Ali, ruler of the Hejaz, which contained the Muslim holy cities of Mecca and Medina, proclaimed himself caliph, but his claim went unrecognised by the wider Muslim world. Soon afterwards the Hejaz was conquered by Abdul Aziz ibn Saud from central Arabia. The Saudi ruler made it clear that he would not claim the caliphate, while a Muslim conference held in Cairo in 1926 to discuss its revival got nowhere. Later some figures in the Muslim world thought of claiming the title of caliph, the most unlikely being the worldly King Farouk of Egypt, but as a new world order took shape after the Second World War, it seemed that the caliphate had been consigned to history.
Muslim organisations aiming to restore the caliphate, such as Hizb ut-Tahrir, have grown in strength in recent decades, but their chances of success do not seem to have increased. When the Ottoman empire was at its zenith, it was the military power of the sultan that made him the leader of the Muslim world rather than his title of caliph. When Ottoman power was declining, the sultan's attempts to use his position as caliph as a political weapon could not hide the fact that his power was disappearing and few other Muslims wanted to die for his cause. Caliph is an empty title without real power to back it up.