Who helped negotiate between King John and the rebellious barons?

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Magna Carta Opening of the preamble to Magna Carta of 1215; in the British Library (Cotton MS Augustus II 106).

Stephen Langton, the archbishop of Canterbury, played a central role in the negotiations between King John and the rebellious barons leading up to the signing of the Magna Carta in 1215.21

Langton advised and supported the baronial opposition, notably suggesting that they base their demands for liberties on the coronation charter of Henry I. While he initially supported the barons, he later disapproved of violent means and acted as one of the king's commissioners at Runnymede, where he likely influenced clauses concerning ecclesiastical liberties.21

Earlier in King John's reign, other figures such as Hubert Walter, William Marshal, and the justiciar Geoffrey Fitzpeter had also attempted to negotiate with the nobility on the king's behalf regarding their rights.1