Bảo Đại
Bảo Đại ruled as the King of Annam from 1926 to 1945. Japan briefly took control of Vietnam in 1945, and Bảo Đại was made Emperor of Vietnam but with little real power. France took back control of Vietnam in 1949 as the State of Vietnam. Bảo Đại served as Chief of State from then to 1955, but the French had the real power.