Emperor of Austria-Hungary troubled by nationalism during his entire reign. He concluded the Austro-Hungarian Compromise of 1867, which granted greater autonomy to Hungary and transformed the Austrian Empire into the Dual Monarchy of Austria-Hungary. He ruled peacefully for the next 45 years, but personally suffered the tragedies of the execution of his brother, the Emperor Maximilian of Mexico in 1867, the suicide of his only son and heir-apparent, Crown Prince Rudolf, in 1889, the assassination of his wife, Empress Elisabeth ("Sisi"), in 1898, and the assassination of his nephew and heir-presumptive, the Archduke Franz Ferdinand, in 1914.