The course of the Adour was changed in 1578 by dredging under the direction of Louis de Foix, and the river returned to its former mouth. Bayonne flourished after regaining the maritime trade that it had lost for more than a hundred years.
In 1578, Louis de Foix dredged the Adour River, changing its course and restoring it to its previous mouth. This led to Bayonne's revival as maritime trade resumed after a long absence.