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appeared in legal cases, either because the issues concerned were no longer relevant, or because Magna Carta had been superseded by more relevant legislation.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 liege men..." The Great Charter was referred to in legal cases throughout the medieval period. For example, in 1226, the knights of Lincolnshire argued that their local sheriff was changing customary practice regarding the local courts, "contrary to their liberty which they ought to have by the charter of the lord king". In practice, cases were not brought against the King for breach of Magna Carta and the Forest Charter, but it was possible to bring a case against the King's officers, such as his sheriffs, using the argument that the King's officers were acting contrary to liberties granted by