In 1681, Louis XIV had given his consent that his cousin marry the duc de Lauzun, the only man she ever loved, on the condition she make the Duke of Maine, the newly legitimised son of the king and Mme de Montespan, her heir. All she could be made to accept, against her will, was to give the young duke the county of Eu and the principality of Dombes. Upon which, untrue to his word, Louis XIV refused to let her marry Lauzun.