The remains of the castle of Saint-Aubin-du-Cormier are located in the eponymous town, in Ille-et-Vilaine, 20 km southwest of Fougères.
He had built on a ridge overlooking the Couesnon valley, the course of which is only a few kilometers north of the village. It was Duke Pierre I of Brittany who decided to build it in 1225 in order to monitor the valley and impose his authority on the lordships of Rennes (already the seat of a county), Vitré and Fougères.
The enclosure had the shape of a quadrilateral of 100 m by 30 and it was marked out by ten towers.
However, Peter I then allied himself with the English, the king of France Louis IX besieged the castle in 1231 and the Duke of Brittany ended up submitting to the king in 1234.
A century later, during the wars of Succession of Brittany, the site is taken on several occasions. The castle was then remodeled and ramparts were erected around the city in 1430.
These defensive reinforcements were insufficient when François II of Brittany was defeated, near the castle, by the French royal troops during the "Mad War", in 1488. In 1490, the castle was dismantled and finally abandoned.
Only the remains of the keep remain, which have been classified. During a walk in this charming city of character, they can be admired, framed, as well as some elements of the old ramparts, by hundred-year-old trees, which gives the site a romantic atmosphere.
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