Vieux-château de l'Île d'Yeu

The Vieux-château de l'île d'Yeu is a fortification on Île d'Yeu off the French Atlantic coast in the département of Vendée.

Olivier IV de Clisson, a great builder of castles, undertook the work with the aim of protecting the islanders in the event of foreign invasion. The longest of these had been led by the famous English pirate, Robert Knolles, who managed to seize the castle in 1355 and occupied the island for 37 years. In 1381, Île d'Yeu was retaken during the reconquest of Poitou by his son, Olivier V de Clisson.

During the Renaissance, Jean V de Rieux, master of the isle, erected towered walls around the castle. This type of construction was carried out by Italian engineers brought back from the Italian Wars by King Francis I.