Inside Photo by Bill Nicholls
All above 6 photos by Bill Nicholls
The site sign says it dates from the Neolithic period around 2500-2000BC and was reoccupied and reinforced in Roman times and later.
Castell Bryn Gwyn, the name means "White Hill Castle", is west of Brynsiencyn on Anglesey.
It consists of as single bank and outer ditch 130ft (39.5m) in diameter. Today part of the outer area is covered by farm buildings and an access way goes through it. Originally it was thought to have been a henge used for ceremonial use but a number of factors suggests this is wrong. Firstly the ditch on a henge is nearly always inside the bank, while a defensive structure it is outside, and scattered postholes and occupational debris within it suggests it was an occupied area. It may have had a number of uses through history.
The Bryn Gwyn Stones are the remains of a stone circle, located 280m away, and an alignment from them uses Castell Bryn Gwyn for its rising mid summer sun alignment perhaps suggesting an earlier use.
The earliest bank and ditch belong to the end of the Neolithic period (2500-2000 BC), and this is supported by pottery and flints from this period.
During the Iron Age the present wall was built, and refortified in Roman times and later. A very small amount of pottery from the 1st century was also found.
The circular clay and gravel bank, still some 1.5m high, surrounds a level area some 54 metres in diameter, now revetted by stone walls.
About 280 metres to the north-east of here are the Bryn Gwyn Standing Stones. These are two of the tallest standing stones in Wales. The taller stands at over 13ft, and the other at 10ft. There are many sites of standing stones in Anglesey.
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