of Portugal as well, reigned, under various titles, in Flanders and the Franche-Comté, to the north and east of France. In addition, Philip IV controlled large territories in Italy, where he could, at will, impose a fourth front by attacking French-controlled Savoy (In Savoy, Christine Marie of France was acting as regent on behalf of her young son, Charles Emmanuel II, Duke of Savoy). Spain had enjoyed the reputation of having the most formidable military force in Europe, with the introduction of the arquebus and the so-called "Spanish School", but that reputation and tactic had diminished with the Thirty Years' War. Nevertheless, the consummate statesman, Richelieu, decided to force Philip IV to look to his own internal problems. To divert the Spanish troops besieging France, Louis XIII, on the advice of Richelieu, supported John's claim during the Acclamation War on the reasoning that a Portuguese war would drain Spanish resources and manpower. Relations between Portugal and France To fulfill the common foreign policy interests of Portugal and France, a treaty of alliance between the two countries was concluded at Paris on 1 June 1641. It lasted eighteen years before Richelieu's successor as unofficial foreign minister, Cardinal Mazarin, broke the treaty and abandoned his Portuguese and Catalan allies to sign a separate peace with Madrid. The Treaty of the Pyrenees was signed in 1659. Under its terms, France received the portion of Catalonia north of the Pyrenees, known as the Roussillon, and part of the Cerdanya (French Cerdagne). Most important to the Portuguese, the French recognised Philip IV of Spain as the legitimate king of Portugal. Seven years later, in the late stages of the Portuguese Restoration War, relations between the two countries thawed to the extent that the young (but sickly) Afonso VI of Portugal married a French princess, Marie Françoise of Nemours. Relations between Portugal and the Dutch Republic At the time of the revolution in Lisbon (1 December 1640), the Portuguese had been at war with the Dutch for nearly forty years. A good deal of the conflict can be attributed to the fact that Spain and the Dutch Republic were concurrently engaged in the Eighty Years' War (1568–1648), and, ever since hostilities between Portugal and the Dutch Republic erupted in 1602, Portugal had been ruled by a Spanish monarch. The Dutch-Portuguese War was fought almost entirely overseas, with the Dutch mercantile surrogates, the Dutch East India Company