Frederick III (German: Friedrich III., Deutscher Kaiser und König von Preußen; 18 October 1831 -- 15 June 1888) was German Emperor and King of Prussia for 99 days in 1888 during the Year of the Three Emperors.
The Princess Victoria, Princess Royal (Victoria Adelaide Mary Louisa; 21 November 1840 -- 5 August 1901) was the eldest child and daughter of Queen Victoria of the United Kingdom and Prince Albert of Saxe-Coburg and Gotha. She was created Princess Royal of the United Kingdom in 1841. She became German Empress and Queen of Prussia by marriage to German Emperor Frederick III. After her husband's death, she became widely known as Empress Frederick (or, in German: "Kaiserin Friedrich").