Eglise St-Medard
BALLON-SAINT MARS
This parish church was built in 1830 on the site of a Romanesque church became cramped, some relics remain in the rear.
When it was founded, the priory of Grues was a dependency of the Abbey of Saint-Michel-en-l'Herm.
The church was built to plans by the La Roche-sur-Yon architect Libaudière.