- Born on November 2, 1883 in Sauvigny-le-Bois
- Deceased in 1980, at the approximate age of 96 years
Parents
- Joseph Michon-Coster (1848 - 1930), baron Coster, préfet
- Marguerite de Perthuis de Laillevault (1846 - 1928)
Family
- Married on December 27, 1917 in Lausanne, with Gabrielle Bossan (1883 - 1980), issuing
