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Why did Cardinal Mazarin distrust Turenne after 1643?
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Henri de La Tour dāAuvergne, vicomte de Turenne
Henri de La Tour d'Auvergne, vicomte de Turenne, engraving by Robert Nanteuil, 1665; in the National Gallery of Art, Washington, D.C.
After 1643, Cardinal Mazarin viewed Turenne with suspicion primarily due to the conduct of Turenneās brother, the Duc de Bouillon.1
The Duc de Bouillon had previously been involved in a conspiracy against Cardinal de Richelieu, which led to his arrest and the forced surrender of the fortress of Sedan. Because of this familial association and the political instability surrounding the transition of power following the death of Louis XIII, Mazarin remained wary of Turenneās loyalties. Consequently, despite Turenne being appointed a marshal of France in May 1643, Mazarin withheld fresh troops from his command in Italy.1