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Image of Plas-y-Gaer, Allt Ddu (Hillfort) by GLADMAN

Looking north along Cefn Cwm Llwch from Pen y Fan and highlighting the approx position of the settlement. The much more impressive Pen y Crug hillfort is visible beyond.

Image credit: Robert Gladstone

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Miscellaneous

Plas-y-Gaer, Allt Ddu
Hillfort

This enclosure is sited upon the north-eastern flank of Allt Du, which forms the terminal of Cefn Cwm Llwch, northern ridge of Pen-y-Fan.

According to Coflein:

‘A somewhat hooded enclosure, c.100m by 60m, set on a north-east facing hillslope, defined by a bank and ditch, except to the north, where a weak bank is said to have existed.‘

Sites within 20km of Plas-y-Gaer, Allt Ddu