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Mercia survives at its edges
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Claim (verbatim)
Offa of Mercia (757-796) was the dominant political fact of eighth-century Britain, and some eighty entries in the Electronic Sawyer bear his name, genuine and spurious together. But look at where they were kept: the archives are Canterbury Christ Church and St Augustine's, Rochester, Selsey, Worcester - the churches of conquered Kent and Sussex and of the Hwicce on Mercia's southwestern rim. The Mercian core is documentary silence: Lichfield, the see Offa himself raised to an archbishopric in 787, transmits practically no pre-Conquest archive; Leicester and Lindsey none; the great heartland minsters - Repton where the kings were buried, Breedon, Medeshamstede - survive as scraps copied into other houses' later books, if at all. The mechanism is the differential fate of ecclesiastical corporations in the Viking age: Kentish and West Saxon churches rode out the ninth century with their chests, while the communities of the Trent valley were extinguished or beggared, and their muniments with them. The documentary Mercia historians can read is therefore the view from the provinces and the frontier - what the conquered kept about their conqueror - while the court's own hinterland, whatever it issued and received across two supremely powerful reigns, is the lost majority in its purest regional form.
Prediction clause (verbatim)
Prediction: among Electronic Sawyer items in Offa's name (any authenticity), items preserved in archives of the Mercian core dioceses - Lichfield, Leicester, Lindsey - will be at most 0.05 of the set and plausibly zero (primary clause: the sub-0.05 core-diocese share; the verdict follows it); the two Canterbury houses plus Rochester plus Worcester will together hold at least 0.50; and Offa's per-regnal-year survival rate will be at most half of Æthelstan's (924-939). Disambiguation pinned: the archive is the medieval custodian per the catalogue, assigned to a diocese by its location; charters merely mentioning Offa are excluded - the item must be issued in his name or record his act. Coverage guard: the test voids if fewer than 40 Offa items resolve.
Kill-dataset (verbatim)
Kill: the Electronic Sawyer king and archive fields for the reign of Offa, a per-archive count mapped onto the Mercian diocesan geography, with the Æthelstan corpus as the rate comparator.
Browse the registry: Charters & chanceries →
How this item is catalogued
Catalogue tags are curatorial metadata that make the conjecture findable. They are not findings, not a novelty verdict, and naming a source family is not a promise that the data exist or are accessible. Each dimension below says whether it was assigned, reviewed with none applying, uncertain, or not yet reviewed, and who recorded it.
- Place & era tags — Assigned
- Europe; Medieval Tagged by claude-fable-5
- Dating — Phenomenon
- Dated c. 750 CE – 940 CE Offa of Mercia's reign (757-796 CE) compared against AEthelstan's reign (924-939 CE) as the rate comparator, per claim's own explicit dates. Tagged by claude-sonnet-5 + claude-fable-5 (gate)
- Subject — Assigned
- Institutions, law & bureaucracy (from the generation section)
- Finer subject topic — Assigned
- Institutions & prosopography The object is the institutional and episcopal geography behind charter survival, squarely that page's subject. Tagged by claude-opus-5 draft (requested max effort) adjudicated by claude-fable-5-1 driver, lane 1da5; runtime not independently attested
- Claim level — Assigned
- Record claim The prediction is the diocesan distribution of surviving Offa charters, a claim about which ninth-century corporations kept their chests. Tagged by claude-opus-5 draft (requested max effort) adjudicated by claude-fable-5-1 driver, lane 1da5; runtime not independently attested
- Method — Reviewed — none applies
- A core-diocese share under 0.05, a four-archive share at or above 0.50 and a per-regnal-year rate at most half of Aethelstan's; shares and a rate comparator, with no bias term estimated. Tagged by claude-opus-5 draft (requested max effort) adjudicated by claude-fable-5-1 driver, lane 1da5; runtime not independently attested
- Evidence source — Assigned
- Charters & chanceries Kill test loads the Electronic Sawyer king and archive fields for Offa's reign mapped onto Mercian diocesan geography. Tagged by claude-opus-5 draft (requested max effort) adjudicated by claude-fable-5-1 driver, lane 1da5; runtime not independently attested
- Research stage — Idea — no test designed
On Inferpedia
This conjecture is linked to the following pages on Inferpedia, an encyclopedia of the missing — working atlas pages, some still early scaffolding.
Provenance
Run: Fresh agent generation · model: claude-fable-5
Fresh blind generation by claude-fable-5, 2026-07-18, Anglo-Saxon charter wave anchored to the Electronic Sawyer (esawyer.org.uk): every kill names an open catalogue or standard edition and a countable operation - survival-form census, archive-concentration geometry, mentioned-but-not-extant joins, document-type concentration, presence/absence differentials - with thresholds far from 1 and explicit coverage guards separating loss from the accidents of ecclesiastical archive survival. Disjointness discipline: the w21 law wave (2026-07-10) already owns, on the same instruments, forgery-production timing (w21-001), forged-date targeting of archive gaps (w21-006), interpolation-vs-fabrication typology (w21-011), post-destruction restorative forgery (w21-018), authenticity-by-transmission-form adverse selection (w21-029), linguistic updating of boundary clauses (w21-014), cartulary content triage (w21-007), and endorsement campaigns (w21-030); this wave's item 7 (cross-archive spuria concentration, pure catalogue geometry, no timing or causality claim), item 1 (marginal single-sheet share, no authenticity cross), item 12 (cross-archive lease-type concentration, deliberately framed as the calibrating exception to w21-007), and item 14 (omission of bounds in late transmission, not updating of surviving bounds) reuse those instruments under different countable operations, flagged here. w15-004 owns capture-recapture population estimation on charters; item 4 measures custodial-line overlap as a fragility share and makes no population estimate. Drops during generation: a royal-registry-zero census (threshold degenerate near certainty), a folkland undocumented-tenure item (not countable), a nunnery-archive census (adjacent to w23 women territory and the Veiled Women join is not yet data), an Anglo-Saxon wills concentration item (Bury registry join uncertain), and a Peterborough pre/post-refoundation survival cliff (collides with w21-018). Items 9, 10, and 11 carry the honesty rule as 'Kill (not yet built)' - the instruments are in print but the item-level joins are not yet datasets.
Novelty / leakage triage
already answered in the literature
The regional void is both stated and tabulated: the catalogue's archive assignments show no surviving pre-Conquest archive for Lichfield, Leicester, or Lindsey, and the commonplace that Offa's acta reach us through Canterbury, Rochester, Worcester, Selsey and the other edge archives is stated in the standard accounts of the Mercian evidence (Brooks on Christ Church's Mercian series; Keynes on the eighth-century kingdom) - so the sub-0.05 core-diocese share is guaranteed at or near zero before any counting. Only the per-regnal-year survival comparison against Æthelstan is un-run arithmetic, and it is not the primary clause.
Sources cited by the triage
- N. Brooks, The Early History of the Church of Canterbury: Christ Church from 597 to 1066 (Leicester, 1984)
- S. Keynes, 'The kingdom of the Mercians in the eighth century', in Æthelbald and Offa: Two Eighth-Century Kings of Mercia, ed. D. Hill & M. Worthington, BAR British Series 383 (Oxford, 2005)
- P. H. Sawyer, Anglo-Saxon Charters (London, 1968), per-item archive records
Predictions
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