House of Oldenburg in the context of "House of Glücksburg"

The House of Windsor is the current royal house of the United Kingdom and other Commonwealth realms. The house's name was inspired by the historic Windsor Castle estate. The house was founded on 17 July 1917, when King George V changed the name of the royal house from the German Saxe-Coburg and Gotha to the English Windsor due to anti-German sentiment during the First World War. There have been five British monarchs of the House of Windsor: George V, Edward VIII, George VI, Elizabeth II, and Charles III. The children and male-line descendants of Queen Elizabeth II and Prince Philip, Duke of Edinburgh, also genealogically belong to the House of Oldenburg since Philip was by birth a member of the Glücksburg branch of that house.

The monarch is head of state of fifteen sovereign states. These are the United Kingdom, Antigua and Barbuda, Australia, The Bahamas, Belize, Canada, Grenada, Jamaica, New Zealand, Papua New Guinea, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Solomon Islands, and Tuvalu. As well as these separate monarchies, there are also three Crown Dependencies, fourteen British Overseas Territories, two associated states of New Zealand, and one territory.

Margrethe II (Danish: [mɑˈkʁeˀtə]; Margrethe Alexandrine Þórhildur Ingrid, born 16 April 1940) is a member of the Danish royal family who reigned as Queen of Denmark from 14 January 1972 until her abdication on 14 January 2024. Having reigned for exactly 52 years, she was the second-longest-reigning Danish monarch after Christian IV.

Margrethe was born into the House of Glücksburg, a cadet branch of the House of Oldenburg, during the reign of her paternal grandfather, King Christian X. She is the eldest child of King Frederik IX and Queen Ingrid. She became heir presumptive to her father in 1953 when a constitutional amendment allowed women to inherit the throne. In 1967 she married Henri de Laborde de Monpezat, with whom she had two sons, Frederik and Joachim. Margrethe succeeded her father upon his death in January 1972.

Danish overseas colonies and Dano-Norwegian colonies (Danish: De danske kolonier) were the colonies that Denmark–Norway (Denmark after 1814) possessed from 1537 until 1953. At its apex, the colonies spanned four continents: Africa, Asia, Europe, and North America.

The period of colonial expansion marked a rise in the status and power of Danes and Norwegians in the Kalmar Union. Danes and Norwegians during this time increasingly saw themselves as citizens of the same "State Fatherland" (Statsfædrelandet), the realm of the Oldenburg monarchs.

Christian IV (12 April 1577 – 28 February 1648) was King of Denmark and Norway and Duke of Holstein and Schleswig from 1588 until his death in 1648. His reign of 59 years and 330 days is the longest in Scandinavian history.

A member of the House of Oldenburg, Christian began his personal rule of Denmark-Norway in 1596 at the age of 19. He is remembered as one of the most popular, ambitious, and proactive Danish-Norwegian kings, having initiated many reforms and projects. Christian IV obtained for his kingdoms a level of stability and wealth that was virtually unmatched elsewhere in Europe. He engaged Denmark-Norway in numerous wars, most notably the Thirty Years' War (1618–1648), which devastated much of Germany, undermined the Danish economy, and cost Denmark-Norway some of its conquered territories.He rebuilt and renamed the Norwegian capital Oslo as Christiania after himself, a name used until 1925.

The monarchy of Norway is the system used in Norway by which a hereditary monarch reigns as head of state under a constitutional monarchy with a parliamentary system. The Norwegian monarchy can trace its line back to the reign of Harald Fairhair and the previous petty kingdoms which were united to form Norway; it has been in unions with both Sweden and Denmark for long periods.

The present monarch is King Harald V, who has reigned since 17 January 1991, succeeding his father, Olav V. The heir apparent is his only son, Crown Prince Haakon. The crown prince undertakes various public ceremonial functions, as does the king's wife, Queen Sonja. The crown prince also acts as regent in the king's absence. There are several other members of the royal family, including the king's daughter, grandchildren and sister. Since the dissolution of the union between Norway and Sweden and the subsequent election of a Danish prince as King Haakon VII in 1905, the reigning royal house of Norway has been a branch of the Schleswig-Holstein-Sonderburg-Glücksburg branch of the House of Oldenburg; originally from modern-day Schleswig-Holstein in Germany, agnatically (through Prince Philip) the same royal house as the British (since the accession of Charles III), Danish and former Greek royal families.

The monarchy of Denmark is a constitutional institution and an office of the Kingdom of Denmark. The Kingdom includes Denmark proper and the autonomous territories of the Faroe Islands and Greenland. The Kingdom of Denmark was already consolidated in the 8th century, whose rulers are consistently referred to in Frankish sources (and in some late Frisian sources) as "kings" (reges). Under the rule of King Gudfred in 804 the Kingdom may have included all the major provinces of medieval Denmark.

The current unified Kingdom of Denmark was founded or re-united by the Viking kings Gorm the Old and Harald Bluetooth in the 10th century. Originally an elective monarchy, it became hereditary only in the 17th century during the reign of Frederick III. A decisive transition to a constitutional monarchy occurred in 1849 with the writing of the first democratic constitution, replacing the vast majority of the old absolutist constitution. The current Royal House is a branch of the ducal House of Glücksburg, originally from Schleswig-Holstein in modern-day Germany, the House of Glücksburg itself being a collateral branch of the House of Oldenburg. The House of Glücksburg also produced the monarchs of Norway, of the United Kingdom and the former monarch of Greece in the direct male line.

Christian X (Danish: Christian Carl Frederik Albert Alexander Vilhelm; 26 September 1870 – 20 April 1947) was King of Denmark from 1912 until his death in 1947, and the only King of Iceland as Kristján X, holding the title as a result of the personal union between Denmark and independent Iceland between 1918 and 1944.

He was a member of the House of Glücksburg, a branch of the House of Oldenburg, and the first monarch since King Frederick VII born into the Danish royal family; both his father and his grandfather were born as princes of a ducal family from Schleswig. Among his siblings was King Haakon VII of Norway. His son became Frederick IX of Denmark. Among his cousins were King George V of the United Kingdom, Emperor Nicholas II of Russia, and King Constantine I of Greece, while Queen Maud of Norway, was both his cousin and sister-in-law.

Frederick II (Danish: Frederik 2.; 1 July 1534 – 4 April 1588) was King of Denmark and Norway and Duke of Schleswig and Holstein from 1559 until his death in 1588.

A member of the House of Oldenburg, Frederick began his personal rule of Denmark-Norway at the age of 24. He inherited capable and strong realms, formed in large by his father after the civil war known as the Count's Feud, after which Denmark-Norway saw a period of economic recovery and of a great increase in the centralised authority of the Crown.