The church's exterior architecture is strikingly clear-cut, insofar as its visible parts are growing younger from East to West, or older from West to East. The purely Romanesque superposed chapels behind the choir date from the 11th century; the choir itself, the transept and the easternmost bay of the nave date from the late 12th and early 13th century and reflect a transitional style between Romanesque and Gothic architecture; the rest of the nave was rebuilt later in the 13th century, in a sober but well defined Gothic style; while the facade with its porch tower was rebuilt between 1768 and 1773 in the Louis Quinze style. The crossing tower was modified by architect Émile Boeswillwald during a restoration campaign in the years 1852–1858. Interestingly, the former church of the nearby Marmoutier Abbey has an identical architectural history, but in reverse: the western part is Romanesque, the nave is Gothic and the choir was rebuilt in the 18th century. Each church also has a crypt that is even older than the surfacing parts. Inside, the choir is separated from the rear chapels by a wall that appears to shorten the visible space: while the whole building's length is, the total combined length of nave, transept and choir is only.
Description
The church holds the relics of Saint Adelphus since the first half of the 9th century. In the Middle Ages, these relics had become so popular with pilgrims that the Benedictines built a second church nearby specially to serve as a shrine, so as to remain undisturbed in their own sanctuary. The reliquary of Saint Adelphus was later moved back into Saint-Pierre-et-Saint-Paul in the 19th century, after the dissolution of the abbey following the French Revolution. Among the many works of art inside the former abbey church, the four early 16th-century tapestries depicting the life and the miracles of Adelphus, on display in the upper of the superposed Romanesque chapels, are perhaps the most notable. A strikingly gory scene depicts :File:Neuwiller StPierre-Paul 245.JPG|a knight being forced by divine wrath to devour his own hand after having tried to break the saint's sarcophagus. The 12th-century baptismal fonts, the 14th-century statue of the Virgin and Child, the 1478 Entombment of Christ, and the 18th-century carved choir stalls are also especially noteworthy. All these objects are classified as Monuments historiques.
