Prince Oluf, renounced in 1948 due to his marriage to Annie Helene Dorrit Puggard-Müller and became Count of Rosenborg as a consequence, they divorced in 1977. Prince Flemming Valdemar, renounced in 1949 due to his marriage to Ruth Nielsen and became Count of Rosenborg as a consequence. 1953–present
Frederick IX (Danish: Christian Frederik Franz Michael Carl Valdemar Georg; 11 March 1899 – 14 January 1972) was King of Denmark from 1947 to 1972. Born into the House of Glücksburg, Frederick was the elder son of King Christian X and Queen Alexandrine of Denmark. He became crown prince when his father succeeded as king in 1912.