Tréfaven Castle

The Tréfaven powder magazine is the oldest building in the town of Lorient, dating from before the creation of the French East India Company. It is the main building of a 14th century chateau, converted to a fortress in 1482 by Louis II de Rohan-Guémené. In the 18th century, the French East India Company stored gunpowder there. Used as a prison during the revolution, the castle was bought by Napoléon in 1805 and assigned to the imperial Navy. The main building was again used as a gunpowder magazine until 1973. The French Navy left in 2002 but remain its owner.