Which son of Christian X and Alexandrine of Mecklenburg-Schwerin was the father of Princess Elisabeth of Denmark?
Princess Elisabeth of Denmark Princess Elisabeth of Denmark, {'1': ", '2': ", '3': 'RE', '4': "} ("Elisabeth Caroline-Mathilde Alexandrine Helena Olga Thyra Feodora Estrid Margrethe Désirée"; born 8 May 1935 in Copenhagen) is the daughter of Hereditary Prince Knud and Hereditary Princess Caroline-Mathilde of Denmark, and is a first cousin of the present Danish monarch, Queen Margrethe II.
William, Prince of Orange William, Prince of Orange (Willem Nicolaas Alexander Frederik Karel Hendrik; 4 September 1840 – 11 June 1879), was heir apparent to the Dutch throne as the eldest son of King William III from 17 March 1849 until his death.