Labeled Towns and Villages in bloom, Éragny, perched on its cliff, dominates the Oise. History knows but little, except that the village finds its origins in a fountain installed by the Romans. In 1564, Jean d'Alesso bought the land and extended the estate. But the revolution will confiscate its property and the commune is born. It became famous in the nineteenth century by the arrival and installation in the presbytery of the writer Bernardin de Saint-Pierre whose novel "Paul and Virginie" will be retained in the bibliography. When the writer dies, the village resumes its anonymity and will preserve it until the 20th century. The installation of a stationery and its presses as well as the development of Cergy-Pontoise will allow the village to take off and become a welcoming and charming city.