Coucy, Robert de (rōbĕrˈ də kōsēˈ) [key], d.1311, French architect, celebrated for his part in the building of Reims Cathedral, which he carried on as master of the works after the death of Hugues Libergier in 1263. Probably the Robert de Coucy traditionally known as the original architect of Reims Cathedral, after the fire of 1211, was his father; their separate works on the cathedral have been confused.
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