In the spring of 1264 Cardinals Simon of Brie and Guy Foulquois were sent to France to reach a compromise and start raising support for the crusade. Charles sent troops to Rome to protect the Pope against Manfred's allies. At Foulquois' request, Charles' sister-in-law Margaret (who had not abandoned her claims to her dowry) pledged that she would not take actions against Charles during his absence. Foulquois also persuaded the French and Provençal prelates to offer financial support for the crusade. Pope Urban died before the final agreement was concluded. Charles made arrangements for his campaign against Sicily during the interregnum; he concluded agreements to secure his army's route across Lombardy and had the leaders of the Provençal rebels executed.