Clause 56
(56) If we have deprived or dispossessed any Welshmen of lands, liberties, or anything else in England or in Wales, without the lawful judgement of their equals, these are at once to be returned to them. A dispute on this point shall be determined in the Marches by the judgement of equals. English law shall apply to holdings of land in England, Welsh law to those in Wales, and the law of the Marches to those in the Marches. The Welsh shall treat us and ours in the same way.