The "Great Charter" (English for the Latin Magna Carta) was not in King John’s best interests. Nor was it his original thought. It was also not the original thought of the barons who forced it on him.
Magna Carta was copied, nearly word for word, from "The Charter of Liberties of Henry I," an earlier charter (1100) from an earlier king (1100-1135) who had granted civil liberties to the English nobility.
Today we also know the Magna Carta as a forerunner of American rights and liberties. People refer to it with reverence. But if granting the "Great Charter" was not in the king’s best interests, and if the king was all-powerful, why did he agree to it? Or did he?
What really happened to bring King John and his nobles together on that June day in 1215?