Magna Carta Magna Carta is a medieval Latin name meaning "Great Charter".In 1215,King John was forced by a group of feudal barons and the Church to grant them a charter of liberty and political rights Magna Carta placed some limits on the king's ability to abuse his royal power.Magna Carta Magna Carta is a medieval Latin name meaning “Great Charter”. In 1215, King John was forced by a group of feudal barons and the Church to grant them a charter of liberty and political rights .Magna Carta placed some limits on the king’s ability to abuse his royal power