On August 24, 1215, Pope Innocent III declared the Magna Carta invalid. An excerpt from the article:
"John appealed to Pope Innocent III who, in a turnaround of policy and support, declared the Magna Carte illegal and invalid in a papal bull. There followed between 1215 and 1217 a series of conflicts known as the Barons' Wars (there would be others later in the century). Some barons even supported Prince Louis, the future King Louis VIII of France (r. 1223-1226). However, the rebels were heavily defeated at the battle of Lincoln in May 1217 and the First Barons' War came to an end with the Treaty of Kingston-on-Thames in September 1217. Although neither the barons nor King John had wholly adhered to the terms of the Magna Carta, it was confirmed in 1225 by John's son and successor Henry III (r. 1216-1272) on his coronation, perhaps even as a condition of it. Although hardly causing an immediate swing from absolute monarchy to constitutional government, the Magna Carta, nevertheless, was a major step on that road and, certainly, it prevented future English kings or queens from ruling entirely as absolute monarchs.
Legacy
In subsequent centuries the Magna Carta became a rallying point for all future calls to curb the power of monarchs in England (and elsewhere) and these movements eventually led to the formation of such now-familiar institutions like parliament, ensuring that the rule of a monarch was, at least to some degree, conducted according to the wishes and benefit of their subjects. The Magna Carta has even been the inspiration for many more recent documents and declarations which have set out principles of law and government. These include the 1791 United States Bill of Rights and the 1948 Universal Declaration of Human Rights.
Back in Britain, four of the charter's clauses are still valid as English law (the others having been repealed or superseded by later legislation). These are the clause protecting the independence of the church, another clause protecting certain rights of London and other towns, and, the most famous part of all the Charter nowadays, clauses number 39 and 40:
No free man shall be seized or imprisoned, or stripped of his rights or possessions, or outlawed or exiled, or deprived of his standing in any other way, nor will we proceed with force against him, or send others to do so, except by the lawful judgement of his equals or by the law of the land.
To no one will we sell, to no one deny or delay right or justice.
Today there are four existing copies of the Magna Carta with two in the British Library in London, one in Salisbury Cathedral and another in Lincoln Castle."