Metalwork , including decoration in enamel , became very sophisticated .
Many spectacular shrines made to hold relics have survived , of which the best known is the Shrine of the Three Kings at Cologne Cathedral by Nicholas of Verdun and others ( ca 1180 -- 1225 ) .
Metalwork , including decoration in enamel , became very sophisticated , and many spectacular shrines made to hold relics have survived , of which the best known is the Shrine of the Three Kings at Cologne Cathedral by Nicholas of Verdun and others ( ca 1180 -- 1225 ) .