Saint-Martin-du-Tertre () is a commune in the Val-d'Oise department in Île-de-France in northern France. It was first attested in 1170 as "Sanctus Martinus de Colle".
Château de Franconville Between 1876 and 1882, André Philippe Alfred Régnier (1837–1913), 3rd Duke of Massa, had the Château de Franconville (rue Corentin Celton ) built under the direction of architect Gabriel-Hippolyte Destailleur. The Maisons-Laffitte castle served as a model. It was converted into a sanatorium in 1929.
Population
See also Communes of the Val-d'Oise department
References
External links Official website
Association of Mayors of the Val d'Oise