The "Château Vieux" or Old Castle was built in the late eleventh century by the Viscounts of Labourd on the location of the Roman castrum Lapurdum dated the 1st century.
Originally it consisted of a single hexagonal tower to which two buildings were added in the 12th century.
In the 17th century, Vauban reorganized the defense of the border against Spain, building the ramparts and consolidating the old castle.
State prison during the revolution it now home the 1er RPIMA (paratroup regiment)mess.
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