Cardinal Talleyrand and Cardinal Nicola Capocci were sent to France to attempt to negotiate a peace between France and England. They were in Paris just before the Battle of Poitiers on 19 September 1356. In the first week of October 1356 Pope Innocent VI wrote to Edward, Prince of Wales, the Black Prince, commending his generous conduct to King John II of France, who had been captured in the battle. In a separate letter the Pope asked the Prince to confer with Cardinal de Talleyrand and Cardinal Nicola Capocci in the interests of peace. Despite the need for a peace, the Pope sent Cardinal Talleyrand as part of the delegation which travelled to Metz at Christmas time, for the Imperial Diet, to witness the promulgation of the famous Golden Bull of the Emperor Charles IV. In the following year, after intense negotiations, the papal negotiators travelled to London for a conference with King Edward. They arrived on 2 July 1347, and were received by the King. Negotiations continued, but no solution was reached. In 1348 the two cardinals arranged a treaty between Charles King of Navarre and Charles Duke of Normandy.