George II of Greece

George II April 1947 reigned as King of Greece from 1922 to 1924 and from 1935 to 1947.

George was born at the royal villa at Tatoi, near Athens, the eldest son of Prince Constantine of Greece and his wife, Princess Sophia of Prussia. George pursued a military career, training with the Prussian Guard at the age of 18, then serving in the Balkan Wars as a member of the 1st Greek Infantry. When his grandfather was assassinated in 1913, his father became King Constantine I and George became the crown prince.

Source: Wikipedia