Evolution map of the ducal domain of Brittany under John VI of Brittany between 1400 and 1428.
File:France - Grand Ouest - map-blank.svg by Sémhur under licence FreeArt or CC-BY-SA 3.0
itself from France_map_Lambert-93_with_regions_and_departments_polygons-blank.svg and France_map_Lambert-93_with_rivers-blank.svg by Eric Gaba (Sting - fr:Sting) under licence GFDL 1.2 or CC-BY-SA 3.0.
From : Joël Cornette, Histoire de la Bretagne et des Bretons : Des âges obscurs au règne de Louis XIV, Tome I, Le Seuil, 2008, P.297
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