While fighting against the Bretons and Blesevins, protecting his territory from Vendôme to Angers and from there to Montrichard, he had more than a hundred castles, donjons, and abbeys constructed, including those at Château-Gontier, Loches (a stone keep), and Montbazon.
Dungeon (Donjon; more than 30 volumes), co-written with Joann Sfar, an extremely ambitious series which attempts to chronicle a Dungeons & Dragons-like dungeon through three separate epochs.
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Trondheim's greatest breakthrough after Lapinot is arguably Dungeon (in French, Donjon), an ambitious series which he created with Joann Sfar, and which has enjoyed a fair amount of popular success.
His paternal grandfather was Pierre de Brézé, who had built a Gothic château near the foundation of the dismantled donjon of Anet.