Prince Wilhelm Eitel Friedrich Christian Karl of Prussia was the second son of Emperor Wilhelm II of Germany by his first wife, Princess Augusta Viktoria of Schleswig-Holstein-Sonderburg-Augustenburg.
Eitel Friedrich as captain of the First Regiment of Foot Guards, Potsdam, in 1914
Frederick III, or Friedrich III, was German Emperor and King of Prussia for 99 days from 9 March 1888 until his death in June that year, during the Year of the Three Emperors.
Daguerreotype of Frederick William, c. 1841
Crown Prince Frederick William of Prussia, 1867, by Oskar Begas
Victoria, Princess Royal—eldest daughter of Queen Victoria of the United Kingdom—whom Frederick married in 1858
Frederick and his son, Wilhelm, in October 1863 at Balmoral castle