He was born 9 November 1907 in Potsdam, Brandenburg, German Empire, and died 26 September 1994 in the Marmorpalais by Potsdam. He was the second child and second son of Emperor William III and Empress Cecilia, née Duchess of Mecklenburg-Schwerin. He became German Emperor and King of Prussia upon the death of his father, 20 July 1951. He married on 4 May 1938 in Potsdam to Grand Duchess Kira Kirillovna of Russia (1909-1967), a daughter of Emperor Cyril I of Russia and his wife, Empress Victoria, née Princess of Great Britain and Ireland. Michael (born 1940) Mary Cecilia (born 1942) Kira (1943-2004)