Burg Trifels (Trifels Castle) is a medieval castle at an elevation 500m near the small town of Annweiler, in the Palatinate, Germany. It is located on one peak of a three-way split red sandstone rock (the name Trifels means threefold rock), and it is one of the most popular tourist destinations in the area.First mentioned in a document of 1081, it was a place of safekeeping for the Imperial Regalia of the Holy Roman Empire in the 12th and 13th century. The castle is most famous as the place where the English King Richard I of England (Richard the Lionheart) was imprisoned after his return from the crusades. The castle is characterized by a large well tower outside the ring wall, linked to the castle by a bridge.