Aberlleiniog CastleAnglesey • LL58 8RY • Historic Places
Aberlleiniog Castle on the Isle of Anglesey is an early Norman earthwork castle probably built by Hugh d'Avranches, first Earl of Chester, around 1088 as part of the initial Norman advance into Gwynedd. The castle consists of a motte-and-bailey earthwork with a later stone tower added to the motte, standing in a wooded setting on the eastern shore of Anglesey near the Menai Strait. The site represents one of the earliest phases of Norman penetration into north Wales, preceding the systematic Edwardian castle-building programme of the 1280s by two centuries and providing evidence of the initial conquest of Gwynedd. The surrounding Anglesey landscape is rich in prehistoric and early medieval heritage, from the Neolithic burial chambers at Bryn Celli Ddu to the Roman and early Christian sites that make the island one of the most archaeologically significant parts of Wales.