Penmon, Isle of Anglesey, Gwynedd, north Wales
Location map link for Aberlleiniog Motte

OS 114 SH 616794 R2A fine motte with a hint of a bailey to the south. This one is a documented Norman castle, built by Hugh de Avranches. It is surmounted by a square stone keep used, and possibly built, during the Civil War (1642-48) as a base for gun-running, originally Royalist, then Parliamentarian.
A Guide to Ancient and Historic Wales: Gwynedd, Frances Lynch, Cadw: Welsh Historic Monuments, London, 1995.
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