Frederick VII of Denmark
Upon the death of King Frederick VII of Denmark in 1863, Christian IX acceded to the throne as the first Danish monarch of the House of Glücksburg. Christian IX eventually became known as "Father-in-law of Europe" due to his family ties with most other ruling dynasties of Europe: His daughter Princess Alexandra married Edward VII of the United Kingdom, another daughter Princess Dagmar married Alexander III of Russia and Princess Thyra married Crown Prince Ernst August of Hanover. His son Vilhelm went on to become George I of Greece. Further, his grandson Carl became Haakon VII of Norway. To this day the Danish Royal Family are related to most other reigning European dynasties.