Llywelyn ap Gruffudd defeats his brothers Owain and Dafydd at Bryn Derwin in Arfon, establishing sole control over Gwynedd. Owain is imprisoned for over twenty years. The victory is the foundation of Llywelyn Last career as Prince of Wales, allowing him to consolidate before expanding his authority over other Welsh princes.
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.
Research a location near Merionethshire