In March 1359 when the truce was about to expire, King Jean yielded, trading half his kingdom for his own release. By the Treaty of London he surrendered virtually all of western France from Calais to the Pyrenees, and agreed to an augmented and catastrophic ransom of 4 million gold écus, payable at fixed installments, to be guaranteed by the delivery of forty royal and noble hostages, of whom Enguerrand de Coucy was designated as one.
