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Latitude: 53.1463 / 53°8'46"N
Longitude: -4.1508 / 4°9'2"W
OS Eastings: 256247
OS Northings: 363180
OS Grid: SH562631
Mapcode National: GBR 5P.5S6K
Mapcode Global: WH54M.65NS
Entry Name: Llys Dinorwig
Scheduled Date: 14 March 1995
Source ID: 551
Cadw Legacy ID: CN223
Schedule Class: Monument
Traditional County: Caernarfonshire
Llys Dinorwig comprises two parts: the foundations of at least one rectangular building within an enclosure defined on the west, south and east sides by a fortified scarp and ditch. To the north of the enclosure is a single length of wall, 13.7m long, 1m wide and 5.2m high, representing a further building of possible medieval date. The site was known to Pennant and Fenton and the reference by Leyland to Sir Gruffydd Llwyd as the 'Lord of fair Dinorwig' is significant.
The monument is of national importance for its potential to enhance our knowledge of medieval settlement and Llys sites. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The structures themselves may be expected to contain archaeological information concerning chronology and building techniques.
The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.
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