b ill ates ▁by ▁Pl iny ▁the ▁E lder . ▁ ▁History ▁▁ ▁Sou le ▁has ▁been ▁continu ously ▁inhab ited ▁since ▁the ▁last ▁gla ci ation , ▁there ▁are ▁several ▁depos its ▁from ▁the ▁ne ol ith ic ▁as ▁well ▁as ▁fifteen ▁proto histor ic ▁settlement s . ▁The ▁first ▁text ▁written ▁in ▁Sou le ▁dates ▁from ▁the ▁ 7 th ▁century . ▁ ▁An cient ▁Sou le ▁▁ ▁The ▁territory ▁was ▁already ▁inhab ited ▁in ▁the ▁Middle ▁Pale ol ith ic ; ▁Ne ander th al ▁pre histor ic ▁settlement s ▁have ▁been ▁found ▁in ▁the ▁c aves ▁of ▁X ax ix ilo aga ▁in ▁A uss ur uc q ▁and ▁E tx e ber ri . ▁At ▁the ▁end ▁of ▁the ▁Ne ol ith ic ▁the ▁population ▁had ▁extended ▁and ▁assim il ated ▁knowledge ▁from ▁other ▁pe op les . ▁There ▁are ▁proto histor ic ▁settlement s ▁that ▁show ▁a ▁simple ▁material ▁life ▁and ▁a ▁l ifest yle ▁domin ated ▁by ▁migration . ▁R ests ▁of ▁co ins ▁and ▁other ▁mon et ary ▁artifact s ▁have ▁been ▁found , ▁prov ing ▁the ▁existence ▁of ▁an ▁exchange ▁economy ▁in ▁Sou le , ▁which ▁very ▁likely ▁worked ▁as ▁an ▁access ▁point ▁between ▁Aqu itaine — Nov emp op ul ania — in ▁the ▁north ▁and ▁the ▁southern ▁side ▁of ▁the ▁Py ren ees . ▁ ▁At ▁the ▁time ▁of ▁the ▁Roman ▁arrival ▁in ▁the ▁ 1 st ▁century , ▁Sou le ▁was ▁inhab ited ▁by ▁an ▁Aqu it ani ▁tribe ▁named ▁Sub