Enclosures dating from the Gauls were formed by ditches, dating from the 3rd to the 1st centuries.  One of these ditches surrounds an area of 1,500 metres and is part of a larger enclosure. Within these spaces an important estate was organised†: dwellings, structures for domestic, artisanal and agricultural activities, cultivated fields, pastures.  A monumental doorway and ditches more than 2 metres deep and 3 metres wide indicate that the owners were rich.  Abundant pottery remains were discovered on this site, which shows numerous traces of redevelopment up to the 2nd century AD. At about 200 metres north of this enclosure, a dwelling shows an identical floor plan, but the archaeological remains are more modest. 

During Antiquity, different occupations were developed on the same site as the Gaulish farm, but also on the edge, in the form of new enclosures. If the status of a dwelling dating from Antiquity has not yet been established, different findings witness developments between the 1st and 2nd centuries, as well as some indications from the 3rd-4th centuries: a cemetery for cremated remains, but above all a bronze statue representing a centaur, a remarkable item showing an excellent technique, for which comparable pieces are lacking. 

Between the 6th and the 10^th or 11^th centuries, farms and hamlets were set up inside new quadrangular, regular enclosures, respecting the original parcels of land. Inside were organised housing and artisanal activities with, from the 8^th - 9^th century, specialised spaces (domestic ovens, stores, treatment of cereals . . .). The organisation of the settlement seems to present certain new aspects which have yet to be studied, the excavation and the clearing not being yet terminated. 

About 1,500 years separate the earliest protohistoric indications and the 11^th century when the castle was built. The purpose of this excavation is thus to study the evolution of the different occupations, from the Neolithic to the present day and to study the relations between man and his environment†: how the populations developed their territories, how they managed their resources, their refuse (waste, garbage)... The societies inherited landscapes that they in turn fashioned and then transmitted. The site of La Perdriotais has witnessed these legacies through the continuity of the axes that have structured the landscape during the most recent millenia. Thus, the limits of certain parcels of the modern cadastre follow those of 2,000 or 2,500 years ago. The implantation of this new housing estate thus constitutes a new episode of the history and of the development of this territory.

All these practical considerations find an echo among the developers and inhabitants of Ch‚teaugiron who identify themselves with these discoveries as they "return to live on the very place where their town originated". In the future housing estate, the developers and the elected town councillors have wished to keep the strong points of the discoveries†; street names, sculptures, panels, publications... Numerous actions of communication were carried out by Inrap, in connection with its partners (Regional Archaeological Service and the town of Châteaugiron) and will continue in 2009, year of the town’s millenium†: opening of the site to the public, welcome service for school children of the communes of the Châteaugiron area. Finally, a film, now being realised, will create images of the excavation through the combined regards of the inhabitants of Châteaugiron, the developers, children, artists...