The SMS Hagen (known during its construction as fourth class ironclad

Ironclad warship

An ironclad was a steam-propelled warship in the early part of the second half of the 19th century, protected by iron or steel armor plates. The ironclad was developed as a result of the vulnerability of wooden warships to explosive or incendiary shells. The first ironclad battleship, La Gloire,...

 R or Panzerschiffs IV. Klasse R) was a coastal defence ship

Coastal defence ship

Coastal defence ships were warships built for the purpose of coastal defence, mostly during the period from 1860 to 1920. They were small, often cruiser-sized warships that sacrificed speed and range for armour and armament...

 of the Kaiserliche Marine

Kaiserliche Marine

The Imperial German Navy was the German Navy created at the time of the formation of the German Empire. It existed between 1871 and 1919, growing out of the small Prussian Navy and Norddeutsche Bundesmarine, which primarily had the mission of coastal defense. Kaiser Wilhelm II greatly expanded...

. It was the sixth ship of the Siegfried class

Siegfried class coastal defense ship

The Siegfried class was a group of six coastal defense ships built by the German Kaiserliche Marine in the late 19th century. The ships were intended to protect the German coastline from naval attacks. The class comprised the lead ship , along with her sisters , , , , and...

, all of which were originally classified as fourth class ironclad

Ironclad warship

An ironclad was a steam-propelled warship in the early part of the second half of the 19th century, protected by iron or steel armor plates. The ironclad was developed as a result of the vulnerability of wooden warships to explosive or incendiary shells. The first ironclad battleship, La Gloire,...

s but redesignated coastal defence ships in 1899. It was named after the character Hagen in the Nibelung saga

Nibelung

The German Nibelungen and the corresponding Old Norse form Niflung is the name in Germanic and Norse mythology of the royal family or lineage of the Burgundians who settled at Worms....

.