High Quality Content by WIKIPEDIA articles! SMS Kronprinz was a unique German ironclad warship built for the Prussian Navy in 1866–1867. Kronprinz was laid down in 1866 at the Samuda Brothers shipyard at Cubitt Town in London. She was launched in May 1867 and commissioned into the Prussian Navy that September. The ship was the fourth ironclad ordered by the Prussian Navy, after Arminius, Prinz Adalbert, and Friedrich Carl, though she entered service before Friedrich Carl. Kronprinz was built as an armored frigate, armed with a main battery of sixteen 21 cm (8.3 in) guns; several smaller guns were added later in her career.