Timeline

Key figures

Origin and history

Saint-Flaive Church, located in Ermont, Île-de-France, is a Catholic building dating back to a Carolingian church. This first sanctuary, built on a Merovingian necropolis, housed relics (perhaps those of Saint Filleul) until their transfer to Saint Martin Abbey of Pontoise in 1105. Remnants of this period, including sarcophagi from the 6th to 6th centuries, were discovered in later excavations.

The major reconstruction of 1886–87, led by architect Lucien Magne, revealed a Gallo-Roman villa under the foundations, confirming the sacred seniority of the site. On this occasion, a low side and a bell tower, added in 1629, were integrated or replaced. The excavations also exhumed twelve stone sarcophagus and forty-eight plaster sarcophagus, proving the ancient veneration of the place.

In 1965, architect Gilbert Faux enlarged the church with a lateral construction, discovering twenty-five new sarcophagi and traces of the Carolingian church. These works, blessed by Bishop Renard (Bishop of Versailles), illustrate the continuing evolution of the parish. The remains testify to an uninterrupted religious occupation since the Merovingian period.

Ranked among the remarkable churches of the Vallée de Montmorency, Saint-Flaive embodies an archaeological, medieval and modern heritage. Its history reflects the liturgical and urban transformations of Ermont, from the Merovingian burials to the contemporary extension of the parish community.

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