Henri's foreign worries were compounded by a love affair that had unforeseen consequences. At nearly 57 years of age, Henri had fallen in love again. His new paramour was Charlotte-Marguerite de Montmorency , daughter of the connétable Henri de Montmorency and more than forty years younger than the king. In January 1609, he caught sight of her at a performance of the Ballet de la Reine and was, so it was said, immediately smitten.
Although her father had promised her to François de Bassompierre , the king wanted her to marry his cousin Henri de Condé , a prince of the blood, whom he hoped would be more compliant and less jealous. A mistake. Immediately after the wedding at Chantilly on 17 May 1609, Condé prevented his young bride from responding to the ageing sovereign's attentions. These took the form of romantic letters in which Henri called Charlotte his "beautiful angel" and expressed himself quite unguardedly. Condé, seeking to remove Charlotte from Henri's advances, decided to take her away from the court and out of the country – but not before he had called the king a "tyrant" in public. Here the story takes a political turn, because Condé and Charlotte took refuge in Brussels, among the archdukes that were said to be close to Madrid. Henri IV was furious, feeling that he had been ridiculed in the eyes of other European sovereigns. He cursed and raged, and even asked Sully to cut Condé's purse strings because he was "playing the devil". He even – if we can believe a letter sent to de Préaux, in February 1610 – became depressed, writing "I am wasting away so much from my cares that I am only skin and bones. Everything displeases me, and I flee society […]".
And yet, this sad affair only strengthened the king's resolve to put an end to the Habsburgs. He prepared for battle, ready to redraw the map of Europe.