Bernard de Wisk was a mercenary captain and sometime brigand of the Hundred Years War.
However, after the Treaty of Brétigny was signed on 8 May 1360, Wisk found himself unemployed and so turned to Brigandry.
[2] In 1369, with Bernardon and Hortingo de la Salle, he seized Belleperche Castle, home to Isabella of Valois, Duchess of Bourbon, mother-in-law of the king, Charles V of France and demanded a ransom.
The Duke of Bourbon (Louis II, Duke of Bourbon) was her son, and John Frossart tells us that the siege redoubt he organized was "as strong and as well fortified as a good town might have been".
The Duchess remained a prisoner until 1372, when the king arranged for the ransom to be paid.