In 877, a Danish force aided by the Mercian king Ceolwulf defeated Rhodri Mawr at the "Battle of Sunday" and seized Anglesey, compelling him to flee to Ireland. The fort at Caer Gybi (Holyhead) — built within the walls of a Roman shore fort — was a focal point for defence of the north-west coast. Rhodri returned from Ireland the following year and won a battle to recover Anglesey before being killed by Mercians later in 878.
Aubrey generates in-depth historical research for any location in Britain — drawing on Domesday records, scheduled monuments, Victorian OS maps, geological data and archaeological archives to tell the full story of a place.
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