Knud,_Hereditary_Prince_of_Denmark--Prince_Joachim_of_Denmark

Knud, Hereditary Prince of Denmark (Knud Christian Frederik Michael; 27 July 1900 – 14 June 1976) was a member of the Danish royal family, the younger son and child of King Christian X and Queen Alexandrine.
From 1947 to 1953, he was heir presumptive to his older brother, King Frederik IX, and would have succeeded him as king following his death in January 1972 had it not been for a change in the Danish Act of Succession that replaced him with his niece, Queen Margrethe II.