In 810, Irish monks from Honau, near Strasbourg, founded a convent here, which was destroyed in 1080 by order of Emperor Henry IV. It was rebuilt by Augustinian canons in the 12th century. The current church has a basilica floor plan with three timbered naves. The westwork houses the porch, a pure jewel of 12th-century Romanesque art, with three naves and two bays covered by ribbed vaults. It protects a doorway whose doorways are decorated with colonnettes. The capitals form a frieze depicting scenes of adultery (and the punishments incurred) in connection with the life of Saint Gangolphe, the patron saint of “unmarried men”.