Treaty of Pipton
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The Treaty of Pipton was signed on June 22, 1265 during the Second Barons' War and concluded an alliance between Simon de Montfort and the Welsh prince Llywelyn the Last.
The treaty came after Simon de Montfort's defeat of English King Henry III at the Battle of Lewes in 1264. The king and his son Prince Edward were captured. Llywelyn began negotiations with de Montfort, and in 1265 offered him the sum of 30,000 marks in exchange for a permanent peace, in which Llywelyn's right to rule Wales was acknowledged. The treat established an alliance between Llywelyn and de Montford, but the favourable terms given to Llywelyn in it indicated de Montfort's weakening position.

