Parents
- Hans Ernst von Hardenberg (1729 - 1797), Graf von Hardenberg
- Anna Eleonore von Wangenheim (1731 - 1786)
Family
- Married on August 2, 1786, with Wilhelm Christian Albrecht von Marenholtz ( - 1808), Freiherr von Marenholtz
- Married on June 3, 1798, with Alexandre Maximilien du Tertre (1774 - 1851), vicomte du Tertre, député du Pas-de-Calais, maréchal de camp, divorced
- Married on June 5, 1808, with Benjamin Constant de Rebecque, alias Benjamin Constant (1767 - 1830), député de la Seine, député de la Sarthe