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Cof Cymru: National Historic Assets of Wales · Wales

Twyn Tudor

Ynysddu, Caerphilly, Wales

A scheduled monument in Ynysddu, Caerphilly, recorded as Motte (Medieval).

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Twyn Tudor, Ynysddu, Caerphilly, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Scheduled monument
Site type
Motte
Period
Medieval
Date of designation
2 November 1933
Community
Ynysddu
Unitary authority
Caerphilly
Country
Wales
Coordinates (centre of the scheduled area)
51.63733, -3.16697
SAM number
MM035
Cadw record number
2972

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1636 map "Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ..." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1636 · Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ... (David Rumsey Map Collection, Stanford Libraries)
  • 1865 · England and Wales. England No. 6. (David Rumsey Map Collection, Stanford Libraries)
  • 1895 · Sheet 11. Ordnance Survey of England and Wales. (David Rumsey Map Collection, Stanford Libraries)
  • 1906 · 249 Newport (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1913 · Sheet 102. Newport. (David Rumsey Map Collection, Stanford Libraries)

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This record in Cadw's own full report ↗

Cadw's description

The following provides a general description of the Scheduled Ancient Monument.

The monument comprises the remains of a motte, a military stronghold built during the medieval period. Twyn Tudor stands on level ground high on the western flank of Mynyddislwyn with expansive views to the west and close to the S of St Tudur's church, a late medieval building with presumed ore-conquest origins. It is a large and steep sided mound, 12m high with a slightly dished summit 14m in diameter. A shallow ditch surrounds the S, N and E sides, this is 5m wide and 1.5m deep, becoming 0.6m deep on the N side. The ditch is not discernible on the western side and no bailey is evident. Other than a folk tradition of a burial mound it is undocumented. It lay deep within the upland portion of the former Welsh kingdom of Gwynllwg, annexed by the Clares in the mid-13th century, although it is unclear whether it represents a short-lived relic of the initial Norman invasion of the area, a Welsh seat or a later Clare work. The ambiguous relationship of upland motte and early church is very similar to that at nearby St Illtyd, Llanhilleth (MM141).

The monument is of national importance for its potential to enhance our knowledge of medieval defensive architecture, settlement and the Norman conquest of the Gwynllwg. With the adjacent church the well-preserved monument forms an important element within the wider medieval landscape and shares group value with a series of other upland mottes in the former Welsh territories of Gwynllwg and Senghenydd. It may be expected to contain archaeological information relating to chronology, building techniques and functional detail.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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