Now deconsecrated, this Romanesque church was the religious centre of one Chartres' liveliest areas, the "river workers'" quarter, home to millers, dyers, cobblers, fullers, tanners and tawers. In the 16C it was extended with the addition of a choir and an apsidal chapel built on arches spanning the River Eure. Sadly, the choir and vaults disappeared in 1827. Nowadays, this former collegiate church is a cultural centre hosting events and exhibitions.