Denmark is ruled by a queen (Queen Margrethe II) and her husband is a prince not a king
April 16 - Birthday of Queen Margrethe II (Denmark)
Princess Margrethe married a French diplomat, Count Henri de Laborde de Monpezat, 10 June 1967, at the Church of Holmen in Copenhagen. Laborde de Monpezat received the style and title of "His Royal Highness Prince Henrik of Denmark" because of his new position as the spouse of the heir presumptive to the Danish throne.