Frederick IX1899 - 1972 Born Sat, 11 March 1899 Sorgenfri Palace, Lyngby Kongevej Died Fri, 14 January 1972 Copenhagen Municipal Hospital, Ă˜ster Farimagsgade Buried Roskilde Cathedral, Roskilde Details Parents King of Denmark Christian Frederik Franz Michael Carl Valdemar Georg Lived 72 years, 10 months, 3 days father Christian X 1870 - 1947 mother Alexandrine of Mecklenburg-Schwerin 1879 - 1952 Siblings Brother Knud of Denmark 1900 - 1976