Elimar I, also known as Egilmar I, was the first Count of Oldenburg. He reigned from 1101 to 1108.

According to some sources, Elimar was the son of Elsa of Brabant and Helyas of Lorraine, identified as the Swan Knight of legend. Elimar married Richenza, who according to the annals

Annals

Annals are a concise form of historical representation which record events chronologically, year by year. The Oxford English Dictionary defines annals as "a narrative of events written year by year"...

 of Stade

Stade

Stade is a city in Lower Saxony, Germany and part of the Hamburg Metropolitan Region . It is the seat of the district named after it...

 was the daughter of Dedi or of Adalger.

Elimar is the patrilineal ancestor of the House of Oldenburg

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...

, which notably has ruled as kings (and queen) of Denmark

Denmark

Denmark is a Scandinavian country in Northern Europe. The countries of Denmark and Greenland, as well as the Faroe Islands, constitute the Kingdom of Denmark . It is the southernmost of the Nordic countries, southwest of Sweden and south of Norway, and bordered to the south by Germany. Denmark...

 continuously since 1448, and also as dukes, kings or emperors of several German states, Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

, Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

, Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

 and Greece

Greece

Greece , officially the Hellenic Republic , and historically Hellas or the Republic of Greece in English, is a country in southeastern Europe....

. Current members of the House of Oldenburg and patrilineal descendants of Elimar include Margrethe II of Denmark

Margrethe II of Denmark

Margrethe II is the Queen regnant of the Kingdom of Denmark. In 1972 she became the first female monarch of Denmark since Margaret I, ruler of the Scandinavian countries in 1375-1412 during the Kalmar Union.-Early life:...

, Harald V of Norway

Harald V of Norway

Harald V is the king of Norway. He succeeded to the throne of Norway upon the death of his father Olav V on 17 January 1991...

, Constantine II of Greece

Constantine II of Greece

|align=right|Constantine II was King of Greece from 1964 until the abolition of the monarchy in 1973, the sixth and last monarch of the Greek Royal Family....

, Charles, Prince of Wales

Charles, Prince of Wales

Prince Charles, Prince of Wales is the heir apparent and eldest son of Queen Elizabeth II and Prince Philip, Duke of Edinburgh. Since 1958 his major title has been His Royal Highness The Prince of Wales. In Scotland he is additionally known as The Duke of Rothesay...

 and Christopher, Duke of Schleswig-Holstein (his current senior male line descendant).