 In September 1467 he assisted in negotiations for the marriage of Edward IV's sister, Margaret of York, to Charles the Bold, and accompanied Margaret to her wedding in Burgundy in the following year.In November 1467 he negotiated a commercial treaty with Burgundy at Brussels, and from May 1469 to February 1470 was involved in commercial negotiations with the Hanseatic League in Flanders.In April 1470 he was appointed lieutenant of the Cinque Ports, and by March 1472 was Marshal of Calais.