Baron David-Louis Constant de Rebecque, seigneur d"Hermenches and Villars-Mendraz, a.k.a.
Background
He was the eldest son of Samuel Constant de Rebecque (1676–1756) and his wife, Rose Suzanne née de Saussure de Bercher (1698–1782). His father became member of the Dutch army in 1699. Constant d"Hermenches started in the regiment of his father in 1738.
Career
David-Louis Constant d"Hermenches (17 November 1722 in Lausanne – 25 February 1785 in Paris) was a colonel and commandant of a Swiss regiment in the Dutch Republic and Maréchal de camp in French service with Swiss regiments. He is also known for his contact with Voltaire and his correspondence with Isabelle de Charrière. Later he started a small Swiss regiment in the Dutch States Army.
He bought the seignories Hermenches in 1725 and Villars-Mendraz in 1753.
They fought at the battle of Fontenoy, where Constant d"Hermenches was wounded. He covered the scar above his left eye with a black band across his forehead.
He entered an arranged marriage in 1744 with the daughter of the mayor of Lausanne Louise Anna Jeanne Françoise de Seigneux (1715–1772). He kept up a long correspondence (1760-1776) with Isabelle van Tuyll van Serooskerken, the future Isabelle de Charrière.
In 1776 he remarried Marie Catherine Philippine de Préseau, née Taisnes de Rémonval (1743-1779).