circa 1916: Alexander Karadjordjevic I (1888 - 1934), King of Yugoslavia (1929 - 1934), probably as Crown Prince Alexander of Serbia. He acted as regent for his father King Peter I of Serbia. (Photo by Hulton Archive/Getty Images)
circa 1916: Alexander Karadjordjevic I (1888 - 1934), King of Yugoslavia (1929 - 1934), probably as Crown Prince Alexander of Serbia. He acted as regent for his father King Peter I of Serbia. (Photo by Hulton Archive/Getty Images)