- Born on September 12, 1729
- Deceased in 1785, at the approximate age of 55 years
Parents
- Jacques d'Onyn (1682 - ), seigneur de Chastre
- Marie Columbanus (1696 - )
Family
- Married in 1756, with Marie Catherine de Herckenrode (1731 - 1824), dame de Roost, issuing
Maximilienne (1763 - 1839)- Catherine (1766 - 1842)
Occupations
- conseiller et premier bourgmestre de Louvain