<Li> Emperor Taishō--Emperor of Japan </Li> <Li> Ōkuma Shigenobu--Prime Minister of Japan (16 April 1914--9 October 1916) </Li> <Li> Terauchi Masatake--Prime Minister of Japan (9 October 1916--29 September 1918) </Li> <Li> Hara Takashi--Prime Minister of Japan (29 September 1918--4 November 1921) </Li>

Who was the leader of world war 1