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Victoria, Princess Royal, eldest daughter of Queen Victoria, (1900). Victoria (1840-1901) married Crown Prince Frederick of Prussia in 1858. She was Empress of Germany during his brief reign as Emperor Frederick III before his death in 1888. A print from The Life and Times of Queen Victoria, by Robert Wilson, Volume IV, Cassell and Company, London, Paris, New York, Melbourne, 1900. (Photo by The Print Collector/Print Collector/Getty Images)

Victoria, Princess Royal, eldest daughter of Queen Victoria, (1900). Victoria (1840-1901) married Crown Prince Frederick of Prussia in 1858. She was Empress of Germany during his brief reign as Emperor Frederick III before his death in 1888. A print from The Life and Times of Queen Victoria, by Robert Wilson, Volume IV, Cassell and Company, London, Paris, New York, Melbourne, 1900. (Photo by The Print Collector/Print Collector/Getty Images)

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Members of the Royal Family at Coburg, Germany, April 1894 (1964). The Duke of Connaught, the Duke of Saxe-Coburg and Gotha (formerly the Duke of Edinburgh), Queen Victoria, the German Emperor William II, the Empress Frederick, and the Prince of Wales. A print from King Edward the Seventh, by Philip Magnus, William Clowes and Sons Ltd, London, 1964. (Photo by The Print Collector/Print Collector/Getty Images)

Members of the Royal Family at Coburg, Germany, April 1894 (1964). The Duke of Connaught, the Duke of Saxe-Coburg and Gotha (formerly the Duke of Edinburgh), Queen Victoria, the German Emperor William II, the Empress Frederick, and the Prince of Wales. A print from King Edward the Seventh, by Philip Magnus, William Clowes and Sons Ltd, London, 1964. (Photo by The Print Collector/Print Collector/Getty Images)

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The former Empress Victoria of Germany, Queen of Prussia (1840 - 1901), the widow of German Emperor Frederick III, 1889. She is the eldest child of Queen Victoria. (Photo by Hulton Archive/Getty Images)

The former Empress Victoria of Germany, Queen of Prussia (1840 - 1901), the widow of German Emperor Frederick III, 1889. She is the eldest child of Queen Victoria.  (Photo by Hulton Archive/Getty Images)

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A vintage postcard featuring their majesties Queen Victoria of Great Britain and Empress Frederick of Germany, circa 1890. (Photo by Popperfoto via Getty Images/Getty Images)

A vintage postcard featuring their majesties Queen Victoria of Great Britain and Empress Frederick of Germany, circa 1890. (Photo by Popperfoto via Getty Images/Getty Images)

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Princess Victoria Adelaide Mary Louise, Empress consort in Germany and Queen of Prussia, late 19th century. Victoria Adelaide Mary Louise (1840-1901), daughter of Queen Victoria, was Princess Royal of Great Britain and wife of Emperor Frederick III of Germany. (Photo by The Print Collector/Print Collector/Getty Images)

Princess Victoria Adelaide Mary Louise, Empress consort in Germany and Queen of Prussia, late 19th century. Victoria Adelaide Mary Louise (1840-1901), daughter of Queen Victoria, was Princess Royal of Great Britain and wife of Emperor Frederick III of Germany. (Photo by The Print Collector/Print Collector/Getty Images)