Denmark
Succession to the Danish throne followed the Salic Law 1853 until the Danish Act of Succession of 1953. Prominent morganatic marriages include the 1615 marriage of King Christian IV of Denmark to noblewoman Kirsten Munk. Kirsten was titled "Countess of Schleswig-Holstein" and bore the King 12 children, all styled "Count/Countess of Schleswig-Holstein". King Frederick VII married the ballerina Louise Rasmussen, who was raised to the rank of "Countess Danner" in 1850. There were no children of this marriage. When Christian IX of Denmark's brother, Prince Julius of Schleswig-Holstein-Sonderburg-Glucksburg married Elisabeth von Ziegesar in 1883, the king granted her the title "Countess af Røst".
Until 1971, Danish princes who married women who did not belong to a royal or noble family were refused the Sovereign's authorization, renouncing their right of succession to the throne and royal title (Prince Aage of Denmark morganatically eloped with Matilda Calvi, daughter of Count Carlo Giorgio di Bergolo, in January 1914 but renounced his dynastic rights and titles subsequently). They were granted the non-royal prefix of "Prince" and their descendants bear the title Count af Rosenborg in the Danish nobility.
None of the children of Queen Margrethe II has married a person of either royal birth or of the titled aristocracy. Members of the Royal Family may still lose their place in the line of succession for themselves and their descendants if they marry without the monarch's permission.
Read more about this topic: Morganatic Marriage