Guillaume Joseph de Thier
- Born on June 20, 1724 in Liège
- Deceased on November 21, 1791, at the age of 67 years
Parents
- François Arnould Charles de Thier (1685 - 1744), magistrat
- Marie Josèphe Justine de Plenevaux (1698 - 1738)
Family
- Married on June 30, 1750, with Marie Anne Marguerite du Moulin (1731 - 1758), issuing
- Vincent François (1753 - 1820)
- Melchior Henri (1755 - 1820)