The new church, begun by Blanche de Castille in the second quarter of the 13th century, was consecrated in 1239 by Eudes Rigaud, archbishop of Rouen. The Saint-Gervais-Saint-Protais parish church fuses Gothic and Renaissance architecture. The three-storey Gothic choir dates from 1249. A helicoid staircase gives access to the organ; of Renaissance style, it was influenced by the staircase of the castle of Blois (Loir-et-Cher). The Grosse Tour ("Big Tower") of the church (the north tower) was built between 1542 and 1590. The portal of the northern non-projecting transept still has finely carved wooden doors, which remain the first examples of use of the Renaissance style in the church. It was classified as a historic monument in 1840.