Castell Bryn Gwyn

Castell Bryn Gwyn, officially spelled Castell Bryngwyn, is a prehistoric site on the Isle of Anglesey, west of Brynsiencyn [1]. It is a circular clay and gravel bank covered with grass, still some 1.5 metres high and revetted externally by stone walls, which surround a level area some 54 metres in diameter [1]. Its name means "White Hill Castle" [1]. Later Neolithic pottery indicates use in this period, and it may have been a henge monument at this time [1]. 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 rebuilt in Roman times and later [1].