1 janv. 1925 - ibn Saud Annexed Arab Nation

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On 3 March 1924, the first President of the Turkish Republic, Mustafa Kemal Atatürk, as part of his reforms, constitutionally abolished the institution of the caliphate.[13] Its powers within Turkey were transferred to the Grand National Assembly of Turkey, the parliament of the newly formed Turkish Republic. The title was then claimed by Hussein bin Ali, Sharif of Mecca and Hejaz, leader of the Arab Revolt, but his kingdom was defeated and annexed by ibn Saud in 1925.

https://en.wikipedia.org/wiki/Caliphate