The D'Harscamp were a Belgian aristocratic family from the Namur region, who were Counts of Argenteau. They became wealthy during the Thirty Years' War through possession of the secret of how to cast cannon in a single piece. They endowed many local charitable institutions and a main street of Namur is named after them.
Family members
Jeanne d'Harscamp, Dowager Duchess of Beaufort-Spontin, hosted Louis XIV of France at her chateau at Freÿr, when the Treaty of Freÿr was signed.
Charles-Francois de Paule, Baron d'Harscamp (1669-1736) was Mayor of Namur and then Lieutenant Governor from 1732 to his death. In 1711 he married Marie Isabelle, Comtesse d'Argenteau. They had five children:
References
D'Harscamp Wikipedia(Text) CC BY-SA