sentences:  It is constructed of black marble, with a solid slab long forming the top.The front and sides are overlaid with white marble niches into which are set figures, with the Coronation of the Virgin at the centre.The most celebrated work of art in the cathedral is the "Shrine of the Three Kings", commissioned by Philip von Heinsberg, archbishop of Cologne from 1167 to 1191 and created by Nicholas of Verdun, begun in 1190.