Task: Text Categorization
Input (English): One person who was a part of this agreement had earlier been excommunicated by Innocent III. That excommunication given seven years before this agreement was prompted by the appointment of Stephen Langton to the Archbishopric of Canterbury. Langton led one group in getting this document figured out. That group that pushed for the creation of this document was made up of English barons. For 10 points, name this document that made explicit certain liberties held by the English people, and which was signed by John in Runnymede in 1215.
Output (English): History