Frederik VIII (Danish: Christian Frederik Vilhelm Carl; 3 June 1843 – 14 May 1912) was King of Denmark from 29 January 1906 until his death in 1912.
As the eldest son of King Christian IX, nicknamed "the father-in-law of Europe", Frederick was related to royalty throughout Europe. He was heir apparent to the Danish throne and served as crown prince for more than 42 years. During the long reign of his father, he was largely excluded from influence and political power.
Maria Feodorovna (Russian: Мария Фёдоровна, romanized: Mariya Fyodorovna; 26 November 1847 – 13 October 1928), known before her marriage as Princess Dagmar of Denmark, was Empress of Russia from 1881 to 1894 as the wife of Emperor Alexander III. She was the fourth child and second daughter of Christian IX of Denmark and Louise of Hesse-Kassel. Maria’s eldest son, Nicholas, was the last Emperor of Russia, ruling from 1 November 1894 until his abdication on 15 March 1917.
The Greek royal family (Greek: Βασιλική Οικογένεια της Ελλάδος) was the ruling family of the Kingdom of Greece from 1863 to 1924 and again from 1935 to 1973. The Greek royal family is a branch of the Danish royal family, itself a cadet branch of the House of Glücksburg. The family had replaced the House of Wittelsbach that previously ruled Greece from 1832 to 1862. The first monarch was George I of Greece, the second son of King Christian IX of Denmark. The current head of the family is former Crown Prince Pavlos, who assumed the role on 10 January 2023 upon the death of his father, former King Constantine II.
With the 1974 Greek republic referendum and Article 4 of the Constitution of Greece, all family members have been stripped of their honorific titles and the associated royal status. Many family members born after 1974 still use the titles "Prince of Greece" and "Princess of Greece" to describe themselves, but such descriptions are neither conferred nor legally recognised by the Greek state as royal or noble titles. The family accepts that these terms are not royal titles, but rather personal identifiers.
Ernest Augustus (Ernest Augustus Christian George; German: Ernst August Christian Georg; 17 November 1887 – 30 January 1953) was Duke of Brunswick from 2 November 1913 to 8 November 1918. He was a grandson of George V of Hanover, thus a Prince of Hanover and a Prince of the United Kingdom. He was also a maternal grandson of Christian IX of Denmark and the son-in-law of German Emperor Wilhelm II. The Prussians had deposed King George from the Hanoverian throne in 1866, but his marriage ended the decades-long feud between the Prussians and the Hanoverians.