Historical documents attest to the construction of the first fortifications from the year 996 on the hill known as "Montfortis". The city then became the stronghold of the Montfort family and Amaury I had the ramparts built, of which some vestiges can still be seen. At the end of the 13th century, the county of Montfort joined the Duchy of Brittany following the marriage of Yolande de Montfort with Arthur II of Brittany for an allegiance that would last two centuries. During the Hundred Years War (1337-1453), the fortified castle was destroyed by the English and all that remains of the latter are the ruins of the keep, now called Tour Anne de Bretagne, because it was built under his reign.
It can be seen when arriving in the city, and climbing this road which bypasses it.
Once you have reached the top of the hill, you can take the small dirt road which starts from the intersection with the road to St Léger in order to go through the park to the foot of the keep, if the few hundred meters in gravel do not don't scare you. At the foot of the keep, being 183 meters above sea level, you can contemplate the panoramic view of the town and its surroundings. It is therefore easy to understand why this mound was an ideal place to establish a fortified castle. It is a perfect place for a break after climbing.