For three years the representatives of the Powers of Europe, invited by the Emperor, had been laboriously discussing terms for a general pacification at Osnabrück and Münster. Philip wrote to the nun that the French demands were so insolent that it was clear that they did not want peace;[24] but the Hollanders were more inclined to an accommodation, for they had grown suspicious of the ultimate designs of Mazarin. After interminable intrigues and self-seeking, however, an arrangement was arrived at which practically ended the Thirty Years War; and Spain, beaten to her knees, still burdened with war in Catalonia, on the Portuguese border, and in Flanders, with her kingdom of Naples in full revolt, was obliged to accept, at last, what the world had seen to be inevitable for many {405} years past, the recognition of Protestant Holland as an independent Power. For nearly a hundred years the war with her Protestant former dependency had dragged Spain down, and made her an easy prey to the French, and at last from the sheer impotence of Spain to struggle longer the Treaty of Münster (October 1648) was signed by her, which made Holland free and gave Alsace to France. The central European Powers were satisfied, the religious compromise was ratified, there was nothing more for the Emperor to fight for, and he retired from the war with France, leaving Philip to fight her enemy alone. The long dream of Spain's supremacy over an orthodox Catholic Europe was indeed dissipated at last; she had now to fight for the integrity of her own soil and her continued existence as a great nation, and in this hard strait the empire deserted her. All through the year 1647, Philip remained in Madrid, whilst the wars in Flanders and Catalonia, as well as on the Portuguese frontier, dragged on with various fortunes, but on the whole not disastrously for Spain. The great revolt of Massaniello in Naples for a time threatened Philip with the loss of the kingdom; when the happy thought came to him of sending his brilliant young son, Don Juan, thither as his Commander-in-chief. He arrived at a time when Guise, the French pretender to the Neapolitan crown, had disgusted the fickle populace which had formerly acclaimed him, and by a fortunate _coup de main_ Don Juan recaptured the city for his father in February 1648, to the joy of most of the inhabitants, who were tired of the anarchy which had lasted for a year. The exploit {406} raised the popularity of the young Prince almost as high as that of his famous namesake after Lepanto, and the rejoicings in Madrid to celebrate the victory made the capital for a time seem its old self again.