Liliʻuokalani was the last monarch of the Hawaiian Kingdom who reigned from 1891 to 1893. The only queen regnant of the Hawaiian Kingdom, Liliʻuokalani faced rebellion from her subjects, foreign residents, and United States citizens. The revolutionaries forced her to abdicate the throne and then formed the Republic of Hawaii, effectively overthrowing the 98-year-old monarchy.
2. Constantine XI Palaiologos

3. Wilhelm II
Wilhelm II was the last German Emperor who reigned from 1888 until his abdication in 1918. His abdication, which was brought about by a series of German defeats in the First World War, brought an end to a three-hundred-year reign of the House of Hohenzollern. After his abdication, the monarchy was abolished and Germany was converted into a democratic state, which came to be known as the Weimar Republic.