Llywelyn the Great expelled Gwenwynwyn ab Owain from Powys Wenwynwyn in 1216, taking personal control of the kingdom. He then convened the Council of Aberdyfi at which all the Welsh princes recognised his overlordship and received their lands from him as a feudal superior. This was the closest Wales came to political unity before 1282. Llywelyn was de facto king of all Wales, negotiating with England as an equal through the Treaty of Worcester 1218.
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