The Infanta, Maria Theresa, was no longer heiress to the crown, for King Philip at last had a son; Spain was exhausted by long-continued efforts, and dismayed by the checks received in the, campaign of 1658; the alliance of the Rhine, recently concluded at Frankfurt between the two leagues, Catholic and Protestant, confirmed immutably the advantages which the treaty of Westphalia had secured to France.

The electors had just raised to the head of the empire young Leopold I., on the death of his father, Ferdinand III., and they proposed their mediation between France and Spain.

Whilst King Philip IV.

was still hesitating, Mazarin took a step in another direction; the king set out for Lyons, accompanied by his mother and his minister, to go and see Princess Margaret of Savoy, who had been proposed to him a long time ago as his wife.

He was pleased with her, and negotiations were already pretty far advanced, to the great displeasure of the queen-mother, when the cardinal, on the 29th of November, 1659, in the evening, entered Anne of Austria's room.