Background
Du Peyrer was not from aristocratic stock, but of recent nobility. lieutenant was his father, Jean du Peyrer, who introduced the name de Trois-villes or Tréville into the family. In 1607 he bought the region of Trois-Villes which effectively brought him nobility, according to the customs of the Basque Country at the time.
This purchase also allowed the elder Du Peyrer the right to be considered a gentleman and to sit upon the council of gentlemen in the viscountcy of Soule.