| Guy de Thouars - Allied Breton Chief Philippe Auguste | Destroyed the Mount in 1204. |
| Guillaume du Château - 26th abbé (1299–1314) | Built first enclosure and north tower. |
| Pierre Le Roy - 30th abbé and military chief | Reinforced defences (1386–1410). |
| Robert Jollivet - Abbé-Captain (successor of Le Roy) | Aceva pregnant crenellated in 1417. |
| Louis d'Estouteville - Captain appointed by Charles VII | Ameliora fortifications (Beatrix Tower, 1440). |
| Gabriel du Puy - Lieutenant of François I | Designed Gabriel Tower (1534). |
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