The Basse Œuvre (French for "Lower Work", as distinct from the Nouvel-Œuvre (= "New Work", the present cathedral)), in full the Parish Church of Our Lady of the Basse Œuvre of Beauvais (in French Église Notre-Dame-de-la-Basse-Œuvre de Beauvais), is a church at the west end of Beauvais Cathedral, dated to the 10th century. It was classed as a historic monument in the list of 1840. It is the west end remnant of a much longer church which had been Beauvais's cathedral. It was built in the form of a Roman basilica, a style which still characterized the Carolingian era.