Düsseldorf - Sightseeing - Sights - Barbarossa Pfalz Kaiserswerth (ruins of imperial palace) The imperial palace, originally dating from the 10th century, was built under the rule of Emperor Heinrich III and enlarged between 1174-1184 by Emperor Barbarossa, when he transferred the toll from the Netherlands to Kaiserswerth and needed a for... duesseldorf-tourismus.de
