In 1738, Emperor Charles VI had ennobled them by creating them Barons, for their services in the Habsburg Netherlands.
Charles-Auguste was the youngest son of Baron Jean-Théodore de Tornaco.
[1] Under the French occupation, Napoleon named him mayor of Luxembourg City by decree on 5 April 1811, an office he held until June 1814.
Tornaco was an ardent champion of the cause of the pro-Dutch Orangists, who wanted the Grand Duchy of Luxembourg to remain in personal union with the Dutch King, and he rejected the Belgian Revolution of 1830.
Charles Auguste married Elisabeth de Berlo-Suys (1775-1856) on 11 November 1800 at Berloz.