Magna Carta of 1215 was not really intended to be a list of rights for Englishmen or even the barons themselves. It was more like a contract in which John bound himself to abide by its provisions. The barons only wanted King John to satisfy their complaints against his abusive rule, not overthrow the monarchy. The real significance of this document lies in the basic idea that a ruler, just like everyone else, is subject to the rule of law. When King John agreed to Magna Carta, he admitted that the law was above the king’s will, a revolutionary idea in 1215.

Pope Innocent III replied favorably to King John’s appeal. He condemned Magna Carta and declared it null and void

Magna Carta, carrying with it the idea of “the rule of law,” was reconfirmed a number of times over the next 80 years, becoming a foundation of English law. Eventually, Magna Carta would become the source of important legal concepts found in our American Constitution and Bill of Rights. Among these are the principle of no taxation without representation and the right to a fair trial under law.

https://politicalvelcraft.org/magna-carta/