with preference among the Monarch's children to males over females; among siblings to the elder over the younger; and among Frederick III's remoter descendants by substitution, senior branches over junior branches. Female descendants were eligible to inherit the throne in the event there were no eligible surviving male dynasts born in the male line. As for the duchies, Holstein and Lauenburg where the King ruled as duke, these lands adhered to Salic law (meaning that only males could inherit the ducal throne), and by mutual agreement were permanently conjoined. The duchies of Schleswig (a Danish fief), Holstein and Lauenburg (German fiefs) were joined in personal union with the Crown of Denmark. This difference caused problems when Frederick VII of Denmark proved childless, making a change in dynasty imminent, and causing the lines of succession for the duchies on one hand and for Denmark on the other to diverge. That meant that the new King of Denmark would not also be the new Duke of Schleswig or Duke of Holstein. To ensure the continued adhesion of the Elbe duchies to the Danish Crown, the line of succession to the duchies was modified in the London Protocol of 1852, which designated Prince Christian of Schleswig-Holstein-Sonderburg-Glücksburg, as the new heir apparent, although he was, strictly, the heir neither to the Crown of Denmark nor to the Duchies of Schleswig, Holstein or Lauenburg by primogeniture. Originally, the Danish prime minister Christian Albrecht Bluhme wanted to keep the separate hereditary principles, but in the end the government decided on a uniform agnatic primogeniture, which was accepted by the Parliament. This order of succession remained in effect for a hundred years, then the Salic law was changed to male-preference primogeniture in 1953, meaning that females with no brothers could inherit. In 2009, the mode of inheritance of the throne was once more changed, this time into an absolute primogeniture. This imposed no immediate change on the line of succession as it was then, as Prince Vincent had not yet been born. the line of succession was: Crown Prince Frederik Prince Christian Princess Isabella Prince Vincent Princess Josephine Prince Joachim Count Nikolai Count Felix Count Henrik Countess Athena Princess Benedikte Privileges and restrictions Following the transformation of Denmark's monarchy from elective (at least theoretically, although it had generally descended to the eldest son of the House of Oldenburg since 1448) to hereditary in 1660, the so-called Kongelov