He was born on 14 December 1901 in Athens, Greece, son of Prince Constantine of Greece, Denmark and Norway (later King Constantine I of the Hellenes) and Princess Sophia of Prussia. He became King of the Hellenes upon the death of his brother, George II, on 1 April 1947, and reigned for the rest of his life. He died on 6 March 1964 in Athens. Sophia (born 1938), who is married to Prince John Charles of France and Spain Constantine (born 1940), who succeeded his father as King Constantine II of the Hellenes Irene (born 1942)