Du Châtelet invited Voltaire to live at her country house at Cirey-sur-Blaise in Haute-Marne, northeastern France, and he became her long-time companion under the eyes of her tolerant husband.
Châtelet kutsui hänet asumaan maaseutuasuntoonsa Cirey-sur-Blaiseen Haute-Marneen, Koillis-Ranskaan, ja Voltairesta tuli hänen pitkäaikainen seuralaisensa – pitkämielisen aviomiehen silmien alla.