 In the cathedral's many radiating chapels the keystones depict various types of leaves.Above the transept, the clefs de voûtes include the écu of François II, the last Duke of Bretagne and the écu of Canon Jean Le Baillif and the emblem of Monseigneur Alain Le Maout.Those above the nave include the coat of arms of Monseigneur Raoul Le Moël and Laurent de Groeskaër.