sentences:  Several epidemics of the Black Death followed by the Hundred Years' War interrupted further work, and the façade was not finished until sometime between 1413 and 1430, and fortified with a chemin de ronde and bartizans.The principal nave was vaulted at the same time.Towards the end of the 15th century the chapel of Saint Fulcran was enlarged and a baptistry added to the south-west.