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appeared in legal cases, either because the issues concerned were no longer relevant, or because Magna Carta had been superseded by more relevant legislation.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 the origin of the trial by jury system, and acknowledged the ancient origins of Parliament: because of Magna Carta and this ancient constitution, an English monarch was unable to alter these long-standing English customs. Although the arguments based on Magna Carta were historically inaccurate, they nonetheless carried symbolic power, as the charter had immense significance during this period; antiquarians such as Sir Henry Spelman described it as "the most majestic and a sacrosanct anchor to English Liberties". Sir Edward Coke was a leader in using Magna Carta as a political tool during this period. Still working from the 1225 version