The Marquis de Sable and the Count d'Avaux were the real agents of France a
The Marquis de Sable and the Count d'Avaux were the real agents of France at the negotiation, though the Duke of Longueville was the puppet leader.  The most important delegates were Count Maximilian von Trautmansdorff and John Oxenstierna.  The Spanish-Dutch portion of it was signed ten months before the major settlement, and it was primarily negotiated in the towns of Munster and Osnabruck.  It confirmed the Peace of Augsburg and allowed for toleration of Roman Catholics, Lutherans, and Calvinists in the Holy Roman Empire. FTP, identify this 1648 treaty that ended the Thirty Years' War.
The Marquis de Sable and the Count d'Avaux were the real agents of France at the negotiation, though the Duke of Longueville was the puppet leader.  
Peace of Westphalia