The Magloire window relates episodes from the life of saint Magloire who succeeded saint Samson on the episcopal throne. It dates to 1884 and was the work of the atelier Jacquier and Küchelbecker of Mans. The window's eight lancets each had eight frames. In the lower level, Magloire is shown leaving the world, his being nominated as Samson's successor, his preaching to the people of Dol in front of Mont Dol, abdicating in favour of saint Budoc. In the window's upper level we see Magloire enjoying the solitude of Mont-Dol, curing a rich Breton who gave him half of the island of Sercq where he built a monastery and rescuing a fisherman drowning in the sea. In the tympanum Magloire receives communion surrounded by angels.