AVAN WALLIA MANOR

Identity: confirmed — The registry record and associated National Archives reference identify AVAN WALLIA MANOR in Glamorgan. Independent historical and archival sources identify Avan Wallia (also Avon Wallia/Afan Wallia/Nedd-Afan) as the Welsh barony or manor in the western Glamorgan lordship, distinct from Avan Burgus/Aberavon Borough. The supplied 1491–1680 accounts, surveys, rentals and court records are consistent with the Avan Wallia manorial series.
Representative point: 51.6385, -3.7495
Basis: supported_manorial_centre — Approximate central point in the Afan/Cwmavon valley, near the historical core of the Avan Wallia barony and between its documented constituent areas. No surviving manor-house site for Avan Wallia itself was identified; the better-known Aberavon castle is associated with Avan Burgus rather than securely with this manor.
Point confidence: low
Boundary status: representative_point_only
Boundary period: Medieval to early modern; constituent extent documented in modern historical gazetteer form from the pre-modern parish structure
Boundary confidence: medium
Boundary basis: The best available territorial description states that Avon Wallia consisted of the ancient parishes of Glyncorrwg, Michaelston-super-Avon and Baglan, together with the Clyne division of Llantwit-juxta-Neath parish. The National Library of Wales catalogue confirms surveys and manorial records for Avan Wallia, while the 1659 material is cautioned by Archaeologia Cambrensis as relating primarily to Avan Burgus despite being headed Manor Avan Wallia. Because no accessible source supplied a definitive mapped perimeter for the manor, and because constituent parish boundaries cannot safely be converted into a precise manorial polygon, no boundary polygon is returned.
Sources:
- The National Archives: Avan Wallia Manor, record F237786: https://discovery.nationalarchives.gov.uk/details/c/F237786 — Registry record supplied for the exact manor identity; the page is currently protected by an anti-bot challenge.
- A Gazetteer of Localities in the West Glamorgan Area: https://www.swansea.gov.uk/media/587/A-gazetteer-of-localities-in-the-West-Glamorgan-area/pdf/11_Gazetteer_of_localities_in_the_West_Glamorgan_Area.pdf?m=1599753875287 — Defines Avon Wallia as a manor consisting of Glyncorrwg, Michaelston-super-Avon, Baglan and the Clyne division of Llantwit-juxta-Neath.
- National Library of Wales: Brown Book of Usk, NLW MS 17008D: https://archifau.llyfrgell.cymru/index.php/brown-book-of-usk — Describes the 1570 survey commission and explicitly lists lands in Avan Wallia among the Glamorgan manorial surveys.
- National Library of Wales: Margam Abbey estate deeds: https://archives.library.wales/index.php/margam-abbey-estate-deeds — Confirms archival deeds relating to premises in the parishes and manors of Aberafan, Avon Wallia, Baglan, Glyncorrwg and Michaelston-super-Avan.
- Dictionary of Welsh Biography: Morgan Fychan: https://biography.wales/article/s-MORG-FYC-1288.html — Identifies Avan Wallia or Nedd-Afan as a Welsh barony in the honour of Glamorgan and records its medieval lords.
- Archaeologia Cambrensis, manorial particulars: https://upload.wikimedia.org/wikipedia/commons/a/a6/Archaeologia_cambrensis_%28IA_archaeologiacamb1878unse%29.pdf — States that Avan Wallia and Avan Burgus were distinct and warns that the 1659 survey headed Manor Avan Wallia actually relates substantially to Avan Burgus.
Warnings / uncertainty:
- The representative point is an inferred central location, not a documented manor-house coordinate.
- The historical extent is documented by constituent ancient parishes and the Clyne division, but no sufficiently reliable mapped perimeter was located.
- Do not substitute the modern boundaries of Neath Port Talbot, Aberavon, Baglan, Michaelston-super-Avon or Glyncorrwg for the manorial boundary.
- Avan Wallia must be kept distinct from Avan Burgus, the borough/manor of Aberavon.