Lost southern fabric of the Grand Doyenne of Avranches

This article describes an entity that is not directly attested by a surviving complete source and should not be read as an ordinary documented fact.

Epistemic status

Draft Inferpedia article. The extant Grand Doyenne of Avranches is an attested monument; this entry concerns the inferred or vanished medieval architectural fabric around it, especially the southern extension indicated by archaeological and architectural evidence.

Summary

The Grand Doyenne at Avranches preserves a major twelfth-century building, later changed by deanery and modern uses. Codex source-reading found enough evidence for a narrower Inferpedia object: the lost or partly reconstructed southern side-aisle or associated manorial fabric that is implied by a 2013 archaeological sounding and by architectural history of the site.

What is being inferred

The inferred entity is not the protected monument itself. It is a vanished medieval component of the complex: a southern wall, side-aisle, or related fabric that formed part of the original or early seigneurial arrangement and is no longer preserved as an ordinary complete structure.

What is attested

The official monument record attests a mid-twelfth-century construction horizon and later transformations. The ADLFI archaeological report attests a substantial wall south of the facade with medieval masonry characteristics. Architectural scholarship treats the building as an original lay seigneurial hall that later became associated with the deanery.

Why infer this entity

The read sources require more medieval fabric than the surviving building alone makes visible. The southern wall is a physical trace, while the changing institutional use explains why the current monument does not simply reveal the twelfth-century plan. Inferpedia can preserve that missing architectural object as a review draft without claiming a fully recovered plan.

Evidence ledger

• POP/Merimee official record: anchors the protected building in a mid-twelfth-century campaign and records later transformations.
• Avranches heritage page: describes the hall, cellar, associated lodging, and later deanery context.
• ADLFI/OpenEdition report: records a 2013 sounding with a substantial southern wall matching medieval masonry and supporting a vanished extension.
• Bulletin monumental/Persee: supports an architectural reading of the building as originally a lay seigneurial hall, with deanery use later.

Counterarguments

The surviving monument is already documented, so the Inferpedia object must remain the lost or reconstructed fabric, not the building as a whole. The exact extent, use, and plan of the southern component are not settled by the sources read in this batch. Later changes may also obscure which fabric belongs to the twelfth-century phase.

Confidence scores

• Direct attestation score: 56
• Existence warrant score: 74
• Specificity score: 64
• Reconstruction dependence score: 68
• Counterevidence score: 46

What would change the score

The score would rise if excavation drawings, masonry analysis, or a conservation report precisely mapped the southern extension and its medieval phase. It would fall if the wall is re-dated, assigned to a later campaign, or shown not to belong to the Grand Doyenne complex.