[1] Saint Peter's church was built at the end of the fifth century within the walls of the (Gallo-) Roman city, situated at a cemetery which replaced a former residential area.

During the late Middle Ages and the early modern period the competition of the mendicant orders and then the Wars of Religion permanently weakened the abbey.

The apse and the decor of the nave wall arches were likely built at the end of the 5th century and, as such are among the oldest remains.

The bell tower porch is added to the West; the Notre-Dame Chapel, in the form of a Greek cross, is barrel-vaulted and outfitted with a dome; the South Portal is decorated with sculptures.

Many fragments of the stone fence between the sanctuary for the clergy and the nave have been reused during the building of the bell tower in the 12th century, high up the front of the ancient façade.