"Knud, Hereditary Prince of Denmark (Knud Christian Frederik Michael; 27 July 1900 – 14 June 1976), was the younger son and child of Christian X and ...
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Alexandrine of Mecklenburg-Schwerin.
From 1947 to 1953, he was heir presumptive to his older brother, Frederick IX, and would have succeeded him as king (in 1972) had it not been for a change in the Danish Act of Succession that replaced him with his niece, Margrethe II." - (en.wikipedia.org 01.07.2020)
