House of Oldenburg /

The House of Oldenburg is a North German dynasty and one of Europe's most influential Royal Houses with branches that rule or have ruled in Denmark, Russia, Greece, Norway, Schleswig, Holstein, Oldenburg and Sweden. The current Queen of Denmark, the King of Norway and the ex-King of Greece as well as consorts of Spain, Greece and the United Kingdom belong to this House. It rose to prominence when Count Christian I of Oldenburg was elected King of Denmark in 1448, and of Norway in 1450. The house has occupied the Danish throne ever since. Marriages of medieval counts of Oldenburg had paved the way for their heirs to become kings of various Scandinavian kingdoms. In 14th century, through marriage with a descendant of King Valdemar I of Sweden and of King Eric IV of Denmark, a claim to Sweden and Denmark was staked, since 1350. At that time, its competitors were the successors of Margaret I of Denmark. In the 15th century, the Oldenburg heir of that claim married Hedwig of Schauenburg, a descendant of Euphemia of Sweden and Norway and also a descendant of Eric V of Denmark. Since descendants better situated in genealogical charts died out, their son Christian (the abovementioned)