High Quality Content by WIKIPEDIA articles! The Siegfried class was a group of six coastal defense ships built by the German Kaiserliche Marine ("Imperial Navy") in the late 19th century. The ships were intended to protect the German coastline from naval attacks. The class comprised the lead ship Siegfried, along with her sisters Beowulf, Frithjof, Heimdall, Hildebrand, and Hagen. All six ships were named after Norse mythological figures.