Source: Der Weltkrieg, 10 (1919): 29.

From Pursuit of an "unparalleled opportunity": American YMCA and prisoner of war diplomacy among the Central Power nations during World War I, 1914-1923 by Kenneth Steuer

  • American: 1900-present
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  • Tsar Boris III of Bulgaria (1894–1943) was the crown prince during most of World War I and became the tsar upon the abdication of his father, Tsar Ferdinand, in September 1918. Source: Der Weltkrieg, 10 (1919): 29.