Castell Bryn Gwyn

Castell Bryn Gwyn is a prehistoric site on the Isle of Anglesey, west of Brynsiencyn. It is a circular clay and gravel bank covered with grass, still some 1.5m high and revetted externally by stone walls, which surround a level area some 54 metres in diameter. Its name means "White Hill Castle".[citation needed]

Castell Bryn Gwyn
Castell Bryn Gwyn, view south from the bank
LocationAnglesey, Wales
RegionGreat Britain
Coordinates53.1784°N 4.2978°W / 53.1784; -4.2978
Materialclay, gravel, dry stone
Foundedend Neolithic
PeriodsNeolithic, Iron Age, Roman
Site notes
Public accessYes

The original use of this site is uncertain although it may have been a religious sanctuary. Later Neolithic pottery indicates use in this period, and it may have been a henge monument at this time. The earliest bank and ditch belong to the end of the neolithic period (2500-2000 BC).[1] During the Iron Age, the present wall was built, and it was refortified in Roman times and later.[2]

Parking is exiguous; the site is accessible from the A4080 by a footpath. Another path follows the low ridge, southwest over stiles to the Bryn Gwyn stones, or northeast, past the site of the former stone circle of Tre'r Dryw Bach, some 800 metres to Caer Lêb where it meets a minor road with limited parking space.[citation needed]

See also


  1. Cadw sign at the site
  2. Cyfeillion Ymddiriedolaeth Archaeolegol Gwynedd, Haf 2009. Friends of the Gwynedd Archaeological Trust, Summer 2009. Prehistoric Funerary and Ritual Survey, pp 32-33