Llywelyn ap Gruffudd captured and destroyed Cefnllys Castle in Maelienydd (north Radnorshire), one of the key Mortimer castles in the middle March. The Mortimers were the dominant Marcher family in this area and the loss of Cefnllys was a major blow to English power in central Wales. Llywelyn followed this with a series of further captures in 1262-63, forcing Henry III to the negotiating table and ultimately achieving the Treaty of Montgomery 1267.
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