The House of Glücksburg (also spelled Glücksborg), shortened from House of Schleswig-Holstein-Sonderburg-Glücksburg, is a Dano-German branch of the House of Oldenburg, members of which have reigned at various times in Denmark, Norway, Greece and several northern German states.
Queen Margrethe II of Denmark, King Harald V of Norway, former king of Greece Constantine II, Queen Sofía of Spain and Prince Philip, Duke of Edinburgh (and his eldest son and heir to the British throne Charles, Prince of Wales) are patrilineal members of cadet branches of the Glücksburg dynasty.
The family takes its ducal name from Glücksburg, a small coastal town in Schleswig, on the southern, German side of the fjord of Flensburg that divides Germany from Denmark.[2] In 1460, Glücksburg came, as part of the conjoined Dano-German duchies of Schleswig and Holstein, to Count Christian VII of Oldenburg whom, in 1448, the Danes had elected their king as Christian I, the Norwegians likewise taking him as their hereditary king in 1450.[2]
In 1564, Christian I's great-grandson, King Frederick II, in re-distributing Schleswig and Holstein's fiefs, retained some lands for his own senior royal line while allocating Glücksburg to his brother Duke John the Younger (1545-1622), along with Sonderburg, in appanage.[2] John's heirs further sub-divided their share and created, among other branches, a line of Schleswig-Holstein-Sonderburg dukes at Beck (an estate near Minden bought by the family in 1605), who remained vassals of Denmark's kings.[2]
By 1825, the castle of Glücksburg had returned to the Danish crown (from another ducal branch called Glücksburg, extinct in 1779) and was given that year by King Frederick VI, along with a new ducal title, to his kinsman Frederick of Schleswig-Holstein-Sonderburg-Beck.[4] Frederick suffixed the territorial designation to the ducal title he already held, in lieu of "Beck" (an estate the family had, in fact, sold in 1745).[2] Thus emerged the extant Dukes of Schleswig-Holstein-Sonderburg-Glücksburg.
The Danish line of Oldenburg kings died out in 1863, and the elder line of the Schleswig-Holstein family became extinct with the death of the last Augustenburg duke in 1931. Thereafter, the House of Glücksburg became the senior surviving line of the House of Oldenburg. Another cadet line of Oldenburgs, the Dukes of Holstein-Gottorp, consisted of two branches which held onto sovereignty into the 20th century. But members of the Romanov line were executed in or exiled from their Russian Empire in 1917, while the Grand Duchy of Oldenburg was abolished in 1918, although its dynastic line survives.[2]
Neither the Dukes of Beck nor of Glücksburg had been sovereign rulers; they held their lands in fief from the ruling Dukes of Schleswig and Holstein, i.e. the Kings of Denmark and (until 1773) the Dukes of Holstein-Gottorp.
Prince Christian of Schleswig-Holstein-Sonderburg-Glücksburg, the fourth son of Duke Friedrich of Glücksburg, was recognized in the London Protocol of 1852 as successor to the childless King Frederick VII of Denmark. He became King of Denmark as Christian IX on 15 November 1863.[2]
Prince Vilhelm, the second son of Crown Prince Christian and Crown Princess Luise, was elected King of the Hellenes on 30 March 1863, succeeding the ousted Wittelsbach Otto of Greece and reigning under the name George I.
Prince Carl, the second son of Frederick VIII of Denmark, Christian IX's eldest son, became King of Norway on 18 November 1905 as Haakon VII of Norway.
Christian IX's daughters, Alexandra of Denmark and Dagmar of Denmark (as Maria Feodorovna) became the consorts of, respectively, Edward VII of the United Kingdom and Alexander III of Russia. As a result, by 1914 descendants of King Christian IX held the crowns of several European realms, and he became known as the "Father-in-law of Europe".
Christian IX's older brother inherited formal headship of the family as Karl, Duke of Schleswig-Holstein-Sonderburg-Glücksburg.
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