House of Glücksburg
Christoph, hereditary prince of Schleswig-Holstein (legal name: "Christoph Prinz zu Schleswig-Holstein"; born 22 August 1949) has been the head of the House of Schleswig-Holstein-Sonderburg-Glücksburg (commonly known as the House of Glücksburg) and, by agnatic primogeniture, of the entire House of Oldenburg since 1980. He is the current titular Duke of Schleswig-Holstein and Duke of Glücksburg, traditionally styled as "His Highness". He is a male-line descendant of Christian I of Denmark, and is also descended cognatically from numerous more recent monarchs, including Queen Victoria, Emperor Alexander II of Russia and several more recent Danish kings.