Choiseul, César, comte Du Plessis-Praslin, duc de

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César Choiseul, comte Du Plessis-Praslin, duc de (sāzär´ kôNt dü plĕsē-prälăN´ dük də shwäzöl´), 1598–1675, marshal of France, diplomat, and soldier. He served as ambassador to Turin and commanded the army in Lombardy during the Thirty Years War. In the Fronde he sided with Cardinal Mazarin and defeated the vicomte de Turenne at Rethel (1650). Choiseul negotiated the Anglo-French alliance of 1670.