In this period the west façade and the tower bay were built, as were the south aisle of the nave with its chapels, and the south arcade pillars. The bases of those pillars resemble the ones of the choir of Mont-Saint-Michel, which was begun after 1444. The arms of Duke John, who died in 1442, were placed in the staircase to the balcony, above the ducal portal, on the south side of the southern tower bay.