Château d'Hermance

Château d'Hermance is a medieval stronghold on Lake Geneva, of which a round tower and sections of the town's defensive walls still stand. It lies in Hermance, a small village in the canton of Geneva right next to the French border, a short drive from central Geneva.

What remains of the castle at Hermance?

The main survivor is the round tower, built in 1337–1338 for Humbert II, Dauphin of Viennois, under the master builder Mermet Jonzier. It was placed where the castle had the least natural protection, so it reinforced the most exposed stretch of the defences. Parts of the walls that once enclosed the fortified town also remain, and together with the tower they are the only visible traces of Hermance's medieval fortifications. The tower has been a listed historic monument since 1921.

What is the castle's history?

The first mention of the castle dates to 1247, in a bull of Pope Innocent IV. At that time the lords of Faucigny, who ruled the area, were establishing a fortified town on the lakeshore. Local accounts say Count Peter II enlarged the castle around 1260 to guard the western approach to the lake. Sources differ on some details of the earliest builders, but all point to the 13th century as the start of the fortress.

During the 14th century the castle changed hands several times amid feudal wars between the region's powerful families. After 1355 Hermance was tied to the House of Savoy. Its military role ended after the Treaty of Saint-Julien in 1603, when the harbour was filled in and the defensive installations were dismantled.

How did the tower survive?

Once it lost its defensive purpose the structure slowly decayed. In the 1820s the Geneva philanthropist Henri-Louis Boissier bought the tower, which halted its ruin. Swiss press reported that conservation work began in 2023 and was expected to finish in 2025. We could not confirm whether the work is complete, so check the current situation before you visit.

What else is nearby?

The tower makes a natural starting point for a stroll through Hermance, often described as one of the best-preserved medieval villages on Lake Geneva. Narrow lanes, old houses and a lakeside promenade make for an easy visit that fits well into a day trip from Geneva. The tower itself is mainly something to admire from outside, set against the walls and the village buildings.

Frequently asked questions

When was the Hermance tower built? The round tower dates from 1337–1338 and was built for Humbert II, Dauphin of Viennois.

Does the whole castle survive? No. Mainly the tower and part of the town walls remain.

Is the site protected? Yes, the tower was classified as a historic monument in 1921.

When did the castle lose its military importance? After the Treaty of Saint-Julien in 1603, when the harbour was filled in and the fortifications taken down.

Can I reach it from Geneva? Yes, Hermance is about 20 minutes from Geneva on the lake's southern shore, near the French border.

Has the restoration finished? Work started in 2023 and was planned to run until 2025. If access to the tower matters to you, check the Hermance municipality website before travelling.

Why visit?

It is a small but readable trace of medieval defence on Lake Geneva. The tower, walls and picturesque village together show how the border zone between Savoy and neighbouring lords once looked. For anyone interested in the history of the Geneva region, it is an easy and calm hour's stop.