Further, in March 1395, Richard II proposed a marriage between himself and Charles VI's daughter Isabella in the interests of peace and the two kings met in October 1396 on the borders of Calais to agree to the union and agree to lengthen the Truce of Leulinghem.[11] The support of Burgundy, among the most powerful of the French nobles, was also vital. In 1391, Burgundy, trying to decide between sending a crusade to either Prussia or Hungary, sent his envoy Guy de La Trémoille to Venice and Hungary to evaluate the situation. Burgundy originally envisioned a crusade led by himself and the Dukes of Orléans and Lancaster, though none would join the eventual crusade.