SMS Kaiser Barbarossa was a German pre-dreadnought battleship of the Kaiser Friedrich III class. The ship was built for the Imperial Navy, which had begun a program of expansion at the direction of Kaiser Wilhelm II. Construction took place at Schichau, in Danzig. Kaiser Barbarossa was laid down in August 1898, launched on 21 April 1900, and commissioned in June 1901. The ship was armed with a main battery of four 24-centimeter (9.4 in) guns in two twin-gun turrets.

SMS Kaiser Karl der Grosse was a German pre-dreadnought battleship of the Kaiser Friedrich III class, built around the turn of the 20th century for the Kaiserliche Marine. Named for the Emperor Charlemagne, Kaiser Karl der Grosse was built in Hamburg, at the Blohm and Voss shipyard. She was laid down in September 1898 and launched in October 1899. A shipyard strike and an accidental grounding delayed her completion until February 1902; she was therefore the last member of her class to enter service. The ship was armed with four 24-centimeter (9.4 in) guns in two twin gun turrets and had a top speed of 17.5 knots.