Ten Years Later: The Vicomte of Bragelonne by Alexandre Dumas Chapter 44 Page 4

His eminence was then in the enjoyment of flourishing health, and the bad years of the Fronde had not yet counted triple and quadruple for him. He was at Sedan, very much annoyed at a court intrigue in which Anne of Austria seemed inclined to desert his cause.

Of this intrigue Letellier held the thread. He had just received a letter from Anne of Austria, a letter very valuable to him, and strongly compromising Mazarin; but, as he already played the double part which served him so well, and by which he always managed two enemies so as to draw advantage from both, either by embroiling them more and more or by reconciling them, Michel Letellier wished to send Anne of Austria’s letter to Mazarin, in order that he might be acquainted with it, and consequently pleased with his having so willingly rendered him a service.