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Glucksburg Family Tree - The Royal House of Denmark, Norway and Greece from Christian IX to Today
The House of Glücksburg is the reigning royal house of Denmark and Norway and the former royal house of Greece, a branch of the ancient House of Oldenburg whose modern members all descend from King Christian IX of Denmark (1818 to 1906) and his wife Louise of Hesse-Kassel. Through the marriages of their six children, a minor ducal family from the Danish-German borderland became the common ancestor of monarchs in Copenhagen, Oslo and Athens, of a British queen consort, of a Russian empress, and of Prince Philip, Duke of Edinburgh.
## Origins
The house takes its name from Glücksburg, a small castle town in Schleswig, and belongs to the Schleswig-Holstein-Sonderburg-Glücksburg line of the House of Oldenburg, which had held the Danish throne since 1448. Christian IX was a prince of that cadet branch with no expectation of ruling until the childless Frederik VII made the Danish succession an open European question. Christian succeeded him in 1863, and within months his second son was elected King of the Hellenes as George I, planting the family in Greece for 110 years. In 1905 his grandson Prince Carl of Denmark accepted the Norwegian throne as Haakon VII, giving Norway its own dynasty after centuries of union with Denmark and then Sweden.
## Notable members
Christian IX was nicknamed the father-in-law of Europe: his daughter Alexandra married Edward VII of the United Kingdom, and his daughter Dagmar became Empress Maria Feodorovna of Russia, mother of Nicholas II. The Danish line runs through Christian X, Frederik IX and Queen Margrethe II, a trained archaeologist and illustrator who reigned from 1972 until her abdication in 2024, to her son King Frederik X and Queen Mary. The Norwegian line runs from Haakon VII and Queen Maud through Olav V, an Olympic sailing champion, to King Harald V and Crown Prince Haakon. The Greek line produced Constantine I, Paul, Constantine II and Queen Anne-Marie, Queen Sofía of Spain, and Prince Andrew's son Philip, consort to Elizabeth II for 73 years.
## Significance
No other western dynasty connects as many surviving monarchies in a single documented lineage. Two of Europe's ten reigning royal families, Denmark and Norway, are Glücksburg in the male line, and the house also sits in the ancestry of the British and Spanish royal families. Its history traces the transformation of European monarchy itself: from the dynastic matchmaking of the 1860s, through the loss of the Russian and Greek thrones, to the constitutional, publicly accountable monarchies of modern Scandinavia.
| Fact | Details |
| --- | --- |
| House name | Schleswig-Holstein-Sonderburg-Glücksburg, a branch of the House of Oldenburg |
| Founding figure of the modern house | Christian IX of Denmark (1818 to 1906) |
| Ancestral seat | Glücksburg Castle, Schleswig |
| Thrones held | Denmark (1863 to present), Greece (1863 to 1973), Norway (1905 to present) |
| Current heads of state | Frederik X of Denmark, Harald V of Norway |
| Best-known member abroad | Prince Philip, Duke of Edinburgh (1921 to 2021) |
| Nickname of its founder | The father-in-law of Europe |
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