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Base Mérimée: Monuments historiques · France

Oppidum gaulois et camp de César

Bailleul-sur-Thérain, Oise, France

The record

Designation
Historic monument, registered (inscrit)
Protection
inscrit MH
Extent of protection
Oppidum gaulois et camp de César (cad. A 870 à 892, 1081, 1082, 745, 746) : inscription par arrêté du 22 octobre 1979
Protection dates
1979/10/22 : inscrit MH
Type
oppidum, camp
Main period of construction
Antiquité, Gallo-romain
Ownership
propriété privée
Lieu-dit
Mont César
Commune
Bailleul-sur-Thérain
Département
Oise
Region
Hauts-de-France
Country
France
Coordinates
49.38874, 2.23818
Mérimée reference
PA00114493

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1695 map "La Generalite de Paris (northern sheet)." (David Rumsey Map Collection, Stanford Libraries).

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This record on the Ministère de la Culture's POP platform ↗

The Ministère de la Culture's notice

Site occupé depuis la préhistoire et à l'aube des temps préhistoriques. Avant l'occupation romaine, c'était un oppidum gaulois important de la peuplade des Bellovaques. Cet oppidum joua probablement un rôle important dans la défense des Bellovaques face à Jules César, non loin de Clermont et Catenoy. Dès la conquête, les romains y installèrent un camp militaire comme à Bratuspantium, Vendeuil, Caply et Caesaromagus. Il s'agit d'une butte calcaire culminant à 137 m au-dessus de la vallée du Thérain où la rivière s'écoule à 50 m au-dessus du niveau de la mer. La partie haute se présente presque entièrement plate sur une grande superficie. Cependant sur le nord-est apparaissent les buttes et surtout il faut signaler vers l'ouest une légère élévation qui a été sans-doute faite de mains d'hommes au temps des gaulois. La partie nord-est entièrement boisée, la partie sud presque entièrement découverte voit ses contres-pentes cultivées toujours plus haut par les paysans, qui ne peuvent toutefois atteindre le haut à cause du terrain très perturbé par les fortifications gauloises.

English translation

The text above is the record as published by the Ministère de la Culture, in French. The English below is a machine translation made by TreeAlive, not by the Ministère de la Culture; it has not been checked by a person. Where the two differ, the original is the record. Report a translation error: privacy@treealive.com

Site occupied since prehistory and at the dawn of prehistoric times. Before Roman occupation, it was an important Gallic oppidum of the Bellovaci people. This oppidum probably played an important role in the defence of the Bellovaci against Julius Caesar, not far from Clermont and Catenoy. From the conquest onwards, the Romans established a military camp there as at Bratuspantium, Vendeuil, Caply and Caesaromagus. It is a chalk hill culminating at 137 m above the Thérain valley where the river flows at 50 m above sea level. The upper part presents itself as almost entirely flat over a large area. However, to the north-east buttes appear and above all it must be noted to the west a slight elevation which was doubtless made by human hands in the time of the Gauls. The north-east part entirely wooded, the south part almost entirely uncovered sees its counter-slopes cultivated always higher by farmers, who cannot however reach the top because of the terrain greatly disturbed by Gallic fortifications.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Base Mérimée, Ministère de la Culture, data last updated 2026-09-17, reused under the Licence Ouverte / Open Licence 2.0 (Etalab). Record text is reproduced unchanged. Ministère de la Culture · Licence Ouverte 2.0
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