Magna Carta the King in the charters. In addition, medieval cases referred to the clauses in Magna Carta which dealt with specific issues such as wardship and dower, debt collection, and keeping rivers free for navigation. Even in the 13th century, some clauses of Magna Carta rarely appeared in legal cases, either because the issues concerned were no longer relevant, or because Magna Carta had been superseded by more relevant legislation. By 1350 half the clauses of Magna Carta were no longer actively used. During the reign of King Edward III six measures, later known as the "Six Statutes", were passed between
Magna Carta government to advance reform through the Provisions of Oxford. The barons were not militarily powerful enough to win a decisive victory, and instead appealed to Louis IX of France in 1263–1264 to arbitrate on their proposed reforms. The reformist barons argued their case based on Magna Carta, suggesting that it was inviolable under English law and that the King had broken its terms. Louis came down firmly in favour of Henry, but the French arbitration failed to achieve peace as the rebellious barons refused to accept the verdict. England slipped back into the Second Barons' War, which was won by