It was the castle from which the Gontaut-Biron took their name, their seat from the twelfth century. Biron was seized by the Cathars in 1211 and retaken by Simon de Montfort, 5th Earl of Leicester the following year.
The Gontaut-Biron lineage derived its name from this castle, which functioned as their residence since the twelfth century. In 1211, Biron was taken over by the Cathars and recaptured by Simon de Montfort, 5th Earl of Leicester, in the subsequent year.