 Eustache Dauger de Cavoye was the brother of Louis Oger de Cavoye, who was King Louis XIV's Chief Marshall of Lodgings in 1677.Following incidents of misconduct (including the manslaughter of a 15-year-old pageboy) he was expelled from the army then interned in St-Lazare at his brother's Louis request.In a letter dated 23 January 1678 in which he implores his sister to help him, he says he has been "detained for more than ten years" and he is dying.