Eglise Notre Dame de Mont-devant-Sassey, Romanesque church in Mont-devant-Sassey, France

Notre-Dame de Mont-devant-Sassey is a church of 37 m length and 19 m width whose parts date from the 11th to the 18th century: an 11th-century crypt, a 12th-century choir and apse, a 13th-century nave and transept, a 14th-century square west tower rising 38 m, and a 15th- to 16th-century fortified upper storey. The exterior shows light grey and beige masonry, a slender spire with a dark roof and a clock face on the tower, a rounded apse with arched windows, and a south portal sheltered by a porch. Inside, a pointed barrel vault on round arches and ashlar columns covers the nave, with wooden benches, a dark wooden pulpit and an organ tribune above a wooden screen.

French historians link the site to a Celtic sanctuary later replaced by a Gallo-Roman church. In the 7th century Saint Begga, great-great-grandmother of Charlemagne, granted rights here to canonesses from Andenne; after Normans sacked their monastery in the 9th century they moved to Mont. A three-aisled basilica with flat roof and eastern transept rose in the 11th century, rebuilt on a new scale around 1150 with transept, apse, choir, two choir flank towers and the crypt.

The church keeps the recumbent slabs of curés Jean François Galopin (1684–1736) and Gabriel Person (1737–1770), plus a Vierge de Pitié and a Virgin and Child in majesty. A monumental painting depicts the Martyrdom of Saint Quentin. The organ tribune was rebuilt by Frédéric Haerpfer in 1928 and restored by Jean Schilstra in 1983.

The church can be visited daily from May to September on request; details are available on mont-devant-sassey.fr. It stands on a hill above the Meuse between Dun-sur-Meuse and Stenay, away from the villages of Mont and Sassey. A volunteer association supports the mayor with maintenance and restoration work.

The south portal, carved in the 13th century, is one of the last two in Lorraine, with Avioth, to keep its original statuary; a 17th-century Gothic porch was added to shelter the figures. The church measures 37 m long, 19 m wide, and its tower rises 38 m.