The death of Queen Mary, on the 17th November, caused a temporary suspension of the proceedings. After the widower, however, had made a fruitless effort to obtain the hand of her successor, and had been unequivocally repulsed, the commissioners again met in February, 1559, at Cateau Cambresis. The English difficulty was now arranged by separate commissioners, and on the third of April a treaty between France and Spain was concluded. By this important convention, both kings bound themselves to maintain the Catholic worship inviolate by all means in their power, and agreed that an oecumenical council should at once assemble, to compose the religious differences, and to extinguish the increasing heresy in both kingdoms. Furthermore, it was arranged that the conquests made by each country during the preceding eight years should be restored. Thus all the gains of Francis and Henry were annulled by a single word, and the Duke of Savoy converted, by a dash of the pen, from a landless soldier of fortune into a sovereign again. He was to receive back all his estates, and was moreover to marry Henry's sister Margaret, with a dowry of three hundred thousand crowns. Philip, on the other hand, now a second time a widower, was to espouse Henry's daughter Isabella, already betrothed to the Infant Don Carlos, and to receive with her a dowry of four hundred thousand crowns. The restitutions were to be commenced by Henry, and to be completed within three months. Philip was to restore his conquests in the course of a month afterwards. Most of the powers of Europe were included by both parties in this treaty: the Pope, the Emperor, all the Electors, the republics of Venice, Genoa and Switzerland, the kingdoms of England, Scotland, Poland, Denmark, Sweden; the duchies of Ferrara, Savoy and Parma, besides other inferior principalities. Nearly all Christendom, in short, was embraced in this most amicable compact, as if Philip were determined that, henceforth and forever, Calvinists and Mahometans, Turks and Flemings, should be his only enemies. The King of France was to select four hostages from among Philip's subjects, to accompany him to Paris as pledges for the execution of all the terms of the treaty. The royal choice fell upon the Prince of Orange, the Duke of Alva, the Duke of Aerschot, and the Count of Egmont. Such was the treaty of Cateau Cambresis. Thus was a termination put to a war between France and Spain, which had been so wantonly undertaken.