The Dictum of Kenilworth reference article from the English Wikipedia on 24-Apr-2004
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Dictum of Kenilworth

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The Dictum of Kenilworthissued in October 1266, were the terms of the supporters of Simon de Montfort for ending their resistance to Henry III of England. Issued from Kenilworth Castle, its main demand was the right to buy back confiscated estates.

The king agreed and after a slight modification of terms, peace was agreed in 1267.