 Originally engaged to Louis Charles de Nogaret de La Valette, Duke of Candale, son of the Duke of Épernon, the match did not take place and she was instead married to Louis de Bourbon, Duke of Mercœur.The young Louis was the son of the Duke of Vendôme, himself an illegitimate son of Henri IV of France and the famous "Gabrielle d'Estrées".Laura married Louis at the Palais Royal in the French capital on 4 February 1651 and was thus became Duchess of Mercœur.