SMS Friedrich der Grosse  was an ironclad turret ship built for the German Kaiserliche Marine. She was the second of three Preussen-class ironclads, in addition to her two sister-ships Preussen and Grosser Kurfürst. Named for Frederick the Great, she was laid down at the Imperial Dockyard in Kiel in 1871 and completed in 1877. Her main battery of four 26 cm (10 in) guns was mounted in a pair of twin gun turrets amidships.

SMS Kaiser  was the lead ship of the Kaiser-class ironclads; SMS Deutschland was her sister ship. Named for the title "Kaiser", held by the leader of the then newly created German Empire, the ship was laid down in the Samuda Brothers shipyard in London in 1871. The ship was launched in March 1874 and commissioned into the German fleet in February 1875. Kaiser mounted a main battery of eight 26 cm (10.2 in) guns in a central battery amidships.