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Saint-Clair-sur-Epte
Saint-Clair-sur-Epte
Commune
	The church of Our Lady, in Saint-Clair-sur-Epte
	Coat of arms
	Location of Saint-Clair-sur-Epte
	Saint-Clair-sur-Epte Saint-Clair-sur-Epte
	Coordinates: 49°12′29″N 1°40′49″E / 49.2081°N 1.6803°E
Country	France
Region	Île-de-France
Department	Val-d'Oise
Arrondissement	Pontoise
Canton	Vauréal
Government
• Mayor (2020–2026)	Christophe Depont
Area 1	12.18 km2 (4.70 sq mi)
Population (2022)	979
• Density	80/km2 (210/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	95541 /95770
Elevation	30–142 m (98–466 ft)
	1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

Saint-Clair-sur-Epte (French pronunciation: [sɛ̃ klɛːʁ syʁ ɛpt] ^ⓘ; literally 'Saint-Clair on Epte') is a commune in the Val-d'Oise department in Île-de-France in northern France. It is situated on the river Epte, 10 km southwest of Gisors.

The treaty of Saint-Clair-sur-Epte in 911 established Rollo, a Norse warlord and Viking leader, as the first Duke of Normandy.

References

^ "Répertoire national des élus: les maires" (in French). data.gouv.fr, Plateforme ouverte des données publiques françaises. 4 May 2022.
^ "Populations de référence 2022" (in French). The National Institute of Statistics and Economic Studies. 19 December 2024.
^ Ordericus Vitalis, The Ecclesiastical History, Book XII. (The Ecclesiastical History of Orderic Vitalis: Books XI, XII and XIII, Translated and edited by Marjorie Chibnall, Oxford University Press, 2002. ISBN 0-19-822242-4)