Église Saint-Martin de Moissac, Romanesque church in Moissac, France

Église Saint-Martin de Moissac is a church built into the walls of a Gallo-Roman bathhouse of the early 4th century. Its nave occupies the frigidarium and its choir the junction of the tepidarium and caldarium. The west gable has three arched openings, the central one smaller, and the lower walls show pale render over brick with exposed patches. A 17th-century porch stands before the Gothic portal.

The church occupies a Gallo-Roman bath suite of a 3rd-century villa, built in the early 4th century; its nave matches the frigidarium and the choir the tepidarium and caldarium. In the 11th century the baths became a parish church, keeping the ancient walls. In 868 the relics of Saint Ansbert were transferred and the church bore his name until the 13th century. Sold as national property during the Revolution, it was bought back by the commune in 1862 and returned to worship.

The church kept the name Saint-Ansbert from 868, when the relics of Moissac's second abbot were transferred there, until the 13th century, according to Marcel Durliat. The Notre-Dame chapel, added on the south side in the late 15th century, was painted with scenes of the life of Christ; these wall paintings, with those on the archivolt of the entrance arch, were listed as monuments historiques in 1953.

The church stands at 28 Avenue de Gascogne, between the railway line, the Bordeaux road and the Canal de Garonne, about 900 m from the abbey of Saint-Pierre. It is no longer in ordinary use and was abandoned in 1910; visits are possible only with a competent guide, twice a week in summer. A metal footbridge built in 1931 for a 200 m branch line long hid the facade from the road.

Archaeological research revealed that sections long thought to be Merovingian are actually Roman structures rising 9 meters (30 feet) high. This discovery changed understanding of which ancient materials were integrated into the medieval building.