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Origin and history

The Baptistery of Portbail, dated the fourth or fifth century, is a rare example of Paleo-Christian architecture in Normandy. His remains, discovered in 1956 during school work, were searched by Michel de Boüard and Christian Pilet between 1956 and 1978. An additional study in 1998 preceded the restructuring of its protective building, erected in 1977 by the Fine Arts. The site, initially close to a fanum (Gallo-Roman Sanctuary) still standing at the time, was transformed into a cemetery in the 7th century, sheltering sarcophagi and a chapel of Saint Michael, destroyed after 1697.

The hexagonal baptismal swimming pool, 60 cm deep and covered with local blue shale slabs, was fed by a hydraulic network from the southeast. The building, unique in its kind to the north of the Loire for this period, raises questions about its function: episcopal residence of Coutances (a hypothesis of François Fichet de Clairfontaine) or monastic baptistery linked to a pre-Scandinavian abbey (thesis of Julien Deshayes). The reference to an abbatia in a ducal act of 1026 supports this latter hypothesis, although archaeological evidence is lacking.

Ranked a historic monument in 1958, the site was partially covered by a powder magazine after its decommissioning. The excavations revealed sarcophagus burials and traces of water pipes, while the cemetery attests to continued occupation until its closure in 1910. Two other Baptisteries outside Episcopal Cities, discovered in Meysse and Roanne, offer parallels to understand this exceptional monument.

The hypothesis of a link with the bishop of Coutances is based on the absence of a local episcopal seat, while the monastic theory is based on ducal donations of the eleventh century. The excavations of 1999, led by François Caligny Delahaye, confirmed the proximity of the fanum and the adaptation of the hydraulic network to bypass its walls. Today, the remains — low walls, swimming pool and pipelines — are protected by a modern structure, reflecting the historic importance of the site.

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