What is House of Oldenburg?
{{refimprove|date=September 2021}} [[Image:Arms of the County of Oldenburg.svg|right|250px]] The '''House of Oldenburg''' belongs to the [[royal family]] of [[Greece]], [[Denmark]] and the [[United Kingdom]]. King [[Constantine II of Greece|Constantine II]] and his descendants and Queen of Denmark and her descendants, The [[Prince Philip, Duke of Edinburgh]], Prince of Greece, Denmark and the United Kingdom and his descendants belongs to this house. [[Category:House of Oldenburg| ]]