Descendants of Christian IX of Denmark
King Christian IX of Denmark (8 April 1818 – 29 January 1906), known as the "father-in-law of Europe", ruled Denmark from 1863 to 1906. He and his queen consort, Louise of Hesse-Kassel (7 September 1817 – 29 September 1898), became the ancestors of many members of European royalty.
Source: Wikipedia — Descendants of Christian IX of Denmark (CC BY-SA 4.0)