 Either side of this are four lancets showing the four evangelists sitting on the shoulders of four Prophets – a rare literal illustration of the theological principle that the New Testament builds upon the Old Testament.This window was a donation of the Mauclerc family, the Counts of Dreux-Bretagne, who are depicted with their arms in the bases of the lancets.Each bay of the aisles and the choir ambulatory contains one large lancet window, most of them roughly 8.1m high by 2.2m wide.