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Origin and history

The church Saint-Leu-Saint-Gilles of Thiais finds its origins in a Christian oratory attested from the fifth century. Between the 6th and 8th centuries, its terroir was ceded to the abbey of Saint-Germain-des-Prés to erect a first church, mentioned in the 9th century in the Polyptych of Irminon. A new building, built at the end of the 12th century, was largely destroyed during the Hundred Years War (14th-15th centuries).

At the beginning of the 15th century, the church was rebuilt and consecrated in 1484 by Louis de Beaumont de la Forêt, bishop of Paris. The 16th century saw the addition of a portal and the partial disorientation of the building. A north side, replacing an old maladry, was built between the 16th and 17th centuries, then rebuilt in Gothic Revival style in 1891–92 by architect Paul Langlois.

The building suffered extensive damage in 1870–71 during the Franco-Prussian war. The bell tower, restored from 1912 to 1914 by Paul Langlois and Marcel Prud Joined the Historical Monuments since 1929, the church preserves medieval elements (Romanesque clocher, southern wall of the nave) and modern additions such as the terracotta guardrail of the Gilardoni tilery (Coisy-le-Roi).

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