House of Glücksburg
Christian X ("Christian Carl Frederik Albert Alexander Vilhelm"; 26 September 1870 – 20 April 1947) was King of Denmark from 1912 to 1947, and the only King of Iceland (as Kristján X) 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.