Les Sables-d'Olonne
In 1800 the arrondissements of Fontenay-le-Comte, Montaigu and Les Sables-d'Olonne were established. La Roche-sur-Yon replaced Fontenay-le-Comte as prefecture in 1804. Fontenay-le-Comte replaced Montaigu as subprefecture in 1811.