Magna Carta is an English charter, originally issued in the year 1215 and reissued later in the 13th century in modified versions, which included the most direct challenges to the monarch's authority to date. The charter first passed into law in 1225. The 1297 version, with the long title (originally in Latin) The Great Charter of the Liberties of England, and of the Liberties of the Forest, still remains on the statute books of England and Wales.
The 1215 Charter required King John of England to proclaim certain liberties, and accept that his will was not arbitrary, for example by explicitly accepting that no "freeman" (in the sense of non-serf) could be punished except through the law of the land, a right which is still in existence today.
Magna Carta was the first document forced onto an English King by a group of his subjects, the feudal barons, in an attempt to limit his powers by law and protect their privileges. It was preceded and directly influenced by the Charter of Liberties in 1100, in which King Henry I had specified particular areas wherein his powers would be limited.