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Caer y Twr Holyhead Mountain
Large hillforts dominated Anglesey in the Iron Age. You can still see their remains at Caer y Twr high on Holyhead mountain, Dinas Gynfor on the north coast, and Din Silwy at Bwrdd Arthur, in the east. The surviving archaeological evidence from across Wales suggests that people lived in dispersed farmsteads, with local community life circulating around focal hillforts.