 Luçon Cathedral is the seat of the Diocese of Luçon (comprising the Vendée), where Cardinal Richelieu once served as bishop.Once a Roman town (‘Lucionensis’), Luçon takes its name from the Latin word for the northern pike (Lucius) and this fish decorates the coat of arms to this day.The town had an important position on the Roman road from Les Sables d'Olonne to Niort, and was a sea port in the Roman period.