Sixty chests for two hundred minsters

Claim (verbatim)

Every surviving Anglo-Saxon charter reached modernity through the muniments of some medieval institution, and the Electronic Sawyer names that custodian in its archive field. The number of distinct archives is on the order of sixty to seventy - against which stand the religious communities actually attested in pre-Conquest England: Sarah Foot's directory for c. 600-900 alone runs past two hundred houses, and Knowles and Hadcock's Medieval Religious Houses registers the wider population of pre-1066 foundations. The arithmetic means that most communities that demonstrably existed transmit not one charter. The mechanism is continuity of corporate custody: an archive survived where a house lived continuously into the later Middle Ages as a cathedral priory or refounded Benedictine abbey, while the hundreds of minsters extinguished or reduced to parish churches in the ninth and tenth centuries took their charter chests into silence with them. Survival is therefore an institutional monoculture - the record of early England filtered through the few dozen corporations that happened to persist - and the same concentration shows inside the surviving set, where a handful of great archives (Worcester, the two Canterbury houses, Winchester Old Minster, Abingdon, Westminster, Bury St Edmunds, Rochester, Glastonbury) dominate the count. The missing majority of the documentary record is, in the first instance, the missing majority of the archives.

Prediction clause (verbatim)

Prediction: the number of distinct medieval archives represented in the Electronic Sawyer will be fewer than 80, and that count will be less than 0.45 of the attested pre-Conquest religious-community count taken from Knowles and Hadcock's pre-1066 English foundations with Foot's c. 600-900 directory as cross-check (primary clause: the sub-0.45 archive-to-attested-house ratio; the verdict follows it); additionally the ten largest archives will together hold at least 0.55 of all archive-assigned items. Disambiguation pinned: an archive is the medieval custodial institution as named by the catalogue, not the modern repository; items with unknown archive are excluded from shares. Coverage guard: the test voids if the archive field is unusable for more than 10 percent of items.

Kill-dataset (verbatim)

Kill: the Electronic Sawyer archive fields (distinct-archive census and per-archive counts) set against the published house-counts in Knowles and Hadcock, Medieval Religious Houses: England and Wales, and Foot, Monastic Life in Anglo-Saxon England, c. 600-900.

Novelty / leakage triage

already answered in the literature

Both registers are printed and the ratio is guaranteed cross-register arithmetic: the corpus's custodial structure is surveyed as roughly sixty charter-preserving archives (the Kemble 'Archives' survey; the catalogue's per-item archive assignments), while Knowles and Hadcock's pre-Conquest registers and Foot's account of the c. 600-900 communities put attested religious houses in the several hundreds - so fewer-than-80 archives against 200+ attested houses clears sub-0.45 with room to spare, and the commonplace that most attested communities transmit not one charter is stated wherever the archives are surveyed. The un-run residue is only the secondary top-ten concentration share.

Predictions

No prediction registered yet.