On May 15, 1213, King John of England finally accepted Stephen Langton as Archbishop of Canterbury. Langston was to have a profound impact in the creation of the Magna Carta in 1215.
"Such questions were not just classroom exercises but real dilemmas for people ruled by kings, especially kings such as John of England, who often made important decisions and inflicted harsh punishments on his subjects without recourse to the law or troubling to obtain the agreement of his bishops and barons. In 1206, these became pressing issues for Langton too, when Pope Innocent III called him to Rome and made him a cardinal, before arranging for him to be appointed archbishop of Canterbury. King John refused to accept the pope’s choice of archbishop; he, like his predecessors, expected to influence the outcome of elections to English bishoprics, so that he could reward his servants and ensure that such important offices were held by men who were faithful to him. Both parties refused to back down and so the pope imposed an interdict on England, meaning that the Church’s sacraments (such as Confession and the Eucharist) were forbidden to everyone in the kingdom. Innocent also excommunicated the king (the Church’s equivalent of outlawry). Almost all of England’s bishops sided with the pope and left England to join Langton in exile in France. Eventually, the threat of rebellion in England and war with France forced King John to accept the pope’s terms, in order to secure the support of the Church. He agreed to become the pope’s vassal and to allow Langton to take up his appointment. The bishops, with Langton at their head, returned to England in the summer of 1213 and began the difficult task of trying to prevent a civil war between the king and his barons."