Charles I

(born Aug. 17, 1887, Persenbeug Castle, Austria—died April 1, 1922, Quinta do Monte, Madeira) Emperor of Austria (1916–18) and king of Hungary (as Charles IV), last ruler of the Austro-Hungarian monarchy. He became heir presumptive to the Habsburg throne on the assassination of his uncle, Francis Ferdinand. After he succeeded Francis Joseph in 1916, he made several abortive attempts to take Austria-Hungary out of World War I. He renounced participation in affairs of state in 1918 and was deposed in 1919. After two failed attempts to regain his Hungarian throne in 1921, he was sent into exile in Madeira, where he died.

Source: Encyclopedia Britannica