Hidden amongst the rolling hills of the Vexin Français lies Grisy-les-Plâtres, a commune whose name whispers tales of gypsum and a rich, layered history. Grisy-les-Plâtres sits atop the sunny slopes of the Colline du Moulin, a gypsum butte offering protection from harsh northern and eastern winds. The commune’s name, Grisy-les-Plâtres, itself speaks of this geological feature. “Plâtres” directly refers to the plaster resulting from the gypsum quarries active since the High Middle Ages. The very name “Grisy” even evolved from describing the area’s gray appearance due to these quarries. The village was initially known as “Griscium” in 1092, evolving through “Grisacium,” “Grify,” “Grisie,” and “Gresy” before finally becoming Grisy-les-Plâtres in 1870.
Grisy-les-Plâtres’ story begins long before its official naming. Evidence suggests human presence in the region as far back as 300,000 years before Christ, with Gaulish settlement beginning in the 6th century BC. The Roman occupation further shaped the area, with the construction of roads connecting even remote communities like Grisy-les-Plâtres. The Romans built a road from Pontoise to Gisors, passing right through Grisy-les-Plâtres. This road is believed to be the catalyst for the village’s creation by residents of Berval, who established the hamlet of St Caprais.
Grisy-les-Plâtres saw numerous changes in power and influence over the centuries. From the Franks, with their twelve small farms, to the devastating Norman invasions that drove residents into the deep forests, the village endured. After the Treaty of Saint-Clair-sur-Epte in 911 divided the Vexin region, the displaced inhabitants returned, rebuilding their homes. During the Middle Ages, Grisy-les-Plâtres was divided into more than twelve seigneuries. In the 13th century, powerful figures like Seigneur Dreux du Rosnel, Count Jehan de Gisors, and the abbots of Saint-Martin Abbey in Pontoise contributed to the construction of the church of St. Caprais. The church’s namesake, St. Caprais, was the son of a high-ranking Roman official and martyred in Agen in 274.
Grisy-les-Plâtres was not immune to the tumultuous events of history. The Hundred Years’ War and the Black Death ravaged the region. The English occupation lasted 17 years, leaving the Vexin devastated until Charles VII finally liberated Pontoise in 1441. A wave of rebuilding followed, but then the religious wars brought new terror. Peace finally returned with Henri IV’s victory in 1594.
Even after the turbulence, life in Grisy-les-Plâtres remained challenging. The 16th to 18th centuries saw the majority of land owned by nobility and clergy, with peasants working the fields and vineyards. Prince Louis François Joseph de Bourbon himself owned land surrounding the village. Most of the village’s rural houses date from this period, although many have been modified over time. A notable example is the switch from thatch to tile roofing, mandated by the municipal council in December 1844.
The French Revolution resonated even in Grisy-les-Plâtres. The village priest, Jean-Baptiste Lefébure, fled to England to escape the Reign of Terror, only returning years later. In 1830, Grisy-les-Plâtres served as the administrative center for eleven neighboring communes and housed a National Guard battalion. This battalion was later replaced by a fire brigade, which itself was disarmed in 1852. During the Franco-Prussian War, the village was occupied by the Prussian army. The municipal council took out a loan to cover increased expenses during this time. In 1876, the current town hall was built, housing both the municipal offices and the village school.
Even the arrival of a railway line connecting Grisy-les-Plâtres to Marines and Valmondois from 1891 to 1948 didn’t dramatically alter the village’s demographics or local commerce. Grisy-les-Plâtres has retained much of its rural character despite these historical shifts, preserving its charm and unique identity.