A bull in middle of the sea (château du Taureau means "Bull's castle")! No, but a castle on its rock.
People of Morlaix get the permission from the duke of Etampes, governor of Brittany, to build a granite fortress, which stones came from island of Calot.
After 10 years of building works, the marquis de Mezgouez, governor of Morlaix appointed by Catherine of Medici, decided to keep the stronghold for himself. Displeased, inhabitants started proceedings against Mezgouez and finally, they won the case! King Louis XIV transformed the fortress into a jail where they notably put the famous Breton La Chalotais...