House of Glücksburg: a look at one of Europe's oldest royal dynasties

House of Glücksburg: a look at one of Europe's oldest royal dynasties
Norway's King Harald speaks during a gala dinner at the Palace in Oslo, Norway, 8 April 2025.
Reuters

The death of King Harald V of Norway at the age of 89 on Friday has put the spotlight on one of Europe’s oldest royal dynasties: the House of Glücksburg.

The name may not be widely known outside of royal circles, but its family tree reaches into the royal houses of Greece, Russia and Spain - and the dynasty still reigns today in Denmark and Norway.

Origins of the dynasty

The dynasty takes its name from the town of Glücksburg in northern Germany, where the family’s castle still stands today. It emerged as a branch of the House of Oldenburg, one of Europe’s historic ruling dynasties, which ruled Denmark from 1448 to 1863.

For much of the 19th century, the Glücksburg branch was a relatively obscure German-Danish ducal family, based at Glücksburg Castle on the Flensburg Fjord.

However, when Denmark’s King Frederik VII died childless in 1863, the centuries-old Oldenburg line came to an end. The succession had already been settled in the years before his death, with Prince Christian of Glücksburg designated as his successor.

A relatively obscure prince was suddenly set to become King Christian IX of Denmark - the beginning of a royal dynasty whose descendants would eventually sit on thrones across Europe.

Norway's Crown Prince Haakon and Crown Princess Mette-Marit visit Honnørbrygga to receive Denmark's King Frederik and Queen Mary in Oslo, Norway, 5 May 2024.
Reuters

As a minor branch of the House of Oldenberg, the throne passed to the House of Glücksburg and Christian of Glücksburg became King Christian IX of Denmark.

European takeover 

It’s through Christian IX that the family established itself in royal families across the continent.

Christian IX fathered six children and four of his offspring sat on the throne, either as monarchs or consorts, due to marriages with other royal families. 

However, the mastermind of the family’s dynastic success, is widely attributed not to Christian IX, but to his ambitious wife Louise of Hesse-Kassel.

Christian's grandsons included Nicholas II of Russia, Constantine I of Greece, George V of the United Kingdom, Christian X of Denmark, and Haakon VII of Norway.

The House of Glücksburg today

Today the House of Glücksburg still finds its lineage in two thrones: Norway and Denmark. King Haakon succeeded his father as King of Norway upon his death on Friday, while King Frederik X sits on the throne in Denmark.

Members of the Norwegian royal family stand next to member of the United Kingdom royal family at Buckingham Palace in London, Britain, 25 October 2005.
Reuters

The house’s ties to the Greek monarchy ended in the early 1970s when the country abolished the monarchy. Russia’s Glücksburg-descended branch finished earlier with the 1918 execution of Tsar Nicholas II and the fall of the Romanovs. 

The United Kingdom’s King Charles III is linked genetically to the lineage through his father Prince Philip. However, his mother Queen Elizabeth II legally severed any dynastic link in the 1960s by declaring that her children would belong to the House of Windsor. 

The current head of the House of Glücksburg is not a monarch at all. Ferdinand, Prince of Schleswig-Holstein, 41, is a successful businessman in Germany.

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