Victoria, Princess Royal in the context of "Wilhelm II"

Wilhelm II (English: Frederick William Victor Albert; German: Friedrich Wilhelm Viktor Albert; 27 January 1859 – 4 June 1941) was the last German Emperor and King of Prussia from 1888 until his abdication in 1918. His fall from power marked the end of the German Empire as well as the Hohenzollern dynasty's 500-year rule over Prussia and its predecessor state, Brandenburg.

Born during the reign of his granduncle Frederick William IV of Prussia, Wilhelm was the son of Prince Frederick William and Victoria, Princess Royal. Through his mother, he was the eldest of the 42 grandchildren of Queen Victoria of the United Kingdom. In March 1888, Wilhelm's father, Frederick William, ascended the German and Prussian thrones as Frederick III. Frederick died just 99 days later, and his son succeeded him as Wilhelm II.

Imperial Majesty (His/Her Imperial Majesty, abbreviated as HIM) is a style used by Emperors and Empresses. It distinguishes the status of an emperor/empress from that of a King/Queen, who are simply styled Majesty. Holders of this style have sometimes been observed to follow religious leaders who are styled "His Holiness" in public ceremonies.

King-Emperors and Queen-Empresses sometimes have used the style Imperial and Royal Majesty (e.g., The Empress Frederick's style Her Imperial and Royal Majesty The German Empress and Queen of Prussia).

Ernest Augustus (German: Ernst August; 5 June 1771 – 18 November 1851) was King of Hanover from 20 June 1837 until his death in 1851. As the fifth son of George III of the United Kingdom and Hanover, he initially seemed unlikely to become a monarch, but none of his older brothers had a legitimate son. When his brother William IV, who ruled both kingdoms, died in 1837, his niece Victoria inherited the British throne under British succession law, while Ernest succeeded in Hanover under Salic law, which barred women from the succession. This ended the personal union between Britain and Hanover that had begun in 1714. He remained heir presumptive to the British throne until the birth of Victoria, Princess Royal in 1840.

Ernest was born in London but was sent to Hanover in his adolescence for his education and military training. While serving with Hanoverian forces near Tournai against Revolutionary France, he received a disfiguring facial wound. He was created Duke of Cumberland and Teviotdale in 1799. Although his mother, Queen Charlotte, disapproved of his marriage in 1815 to her twice-widowed niece, Frederica of Mecklenburg-Strelitz, it proved happy. The eldest son of George III, the Prince of Wales (later George IV), had one child, Charlotte, who was expected to become the British queen, but she died in 1817, giving Ernest some prospect of succeeding to the British and Hanoverian thrones. However, his elder brother Prince Edward, Duke of Kent and Strathearn, fathered the eventual British heir, Victoria, in 1819 shortly before the birth of Ernest's only child, George.

Sophia of Prussia (Sophie Dorothea Ulrike Alice, Greek: Σοφία Δωροθέα Ουλρίκη Αλίκη, romanized: Sofía Dorothéa Oulríki Alíki; 14 June 1870 – 13 January 1932) was Queen of Greece from 18 March 1913 to 11 June 1917 and again from 19 December 1920 to 27 September 1922 as the wife of King Constantine I.

A member of the House of Hohenzollern and child of Frederick III, German Emperor, Sophia received a liberal and Anglophile education, under the supervision of her mother Victoria, Princess Royal. In 1889, less than a year after the death of her father, she married her third cousin Constantine, heir apparent to the Greek throne. After a difficult period of adaptation in her new country, Sophia gave birth to six children and became involved in the assistance to the poor, following in the footsteps of her mother-in-law, Queen Olga. However, it was during the wars which Greece faced during the end of the 19th and the beginning of the 20th century that Sophia showed the most social activity: she founded field hospitals, oversaw the training of Greek nurses, and treated wounded soldiers.

Julius Gustav Neubronner (8 February 1852 – 17 April 1932) was a German apothecary, inventor, company founder, and a pioneer of amateur photography and film. He was part of a dynasty of apothecaries in Kronberg im Taunus. Neubronner was court apothecary to Kaiserin Friedrich, invented the pigeon photographer method for aerial photography, was one of the first film amateurs in Germany, and founded a factory for adhesive tapes. After his death, the company was directed for 70 years by his son Carl Neubronner (13 January 1896 – 19 November 1997).