▁economic ▁t ies ▁to ▁the ▁Ins ular ▁Cel ts , ▁especially ▁for ▁the ▁tin ▁trade . ▁Several ▁tribes ▁also ▁belonged ▁to ▁an ▁" Ar mor ican ▁conf eder ation " ▁which , ▁according ▁to ▁Julius ▁Ca esar , ▁gathered ▁the ▁Cur ios ol ita e , ▁the ▁Red ones , ▁the ▁Os ism ii , ▁the ▁Un elli , ▁the ▁C ale tes , ▁the ▁Lem ov ices ▁and ▁the ▁Amb ib ari i . ▁The ▁last ▁four ▁pe op les ▁mentioned ▁by ▁Ca esar ▁were ▁respectively ▁located ▁in ▁Cot entin ▁( Lower - N orm andy ), ▁pays ▁de ▁C aux ▁( Upper - N orm andy ), ▁Lim ousin ▁( A quit any ) ▁and ▁the ▁location ▁of ▁the ▁Amb ib ari i ▁is ▁unknown . ▁The ▁C ale tes ▁are ▁sometimes ▁also ▁considered ▁as ▁Bel gi ans ▁and ▁ ″ L em ov ices ″ ▁is ▁probably ▁a ▁mistake ▁for ▁ ″ L ex ov ii ″ ▁( Lower - N orm andy ). ▁ ▁Gal lo - R oman ▁era ▁ ▁The ▁region ▁became ▁part ▁of ▁the ▁Roman ▁Republic ▁in ▁ 5 1 ▁BC . ▁It ▁was ▁included ▁in ▁the ▁province ▁of ▁Gall ia ▁L ug d un ensis ▁in ▁ 1 3 ▁BC . ▁Gall ic ▁towns ▁and ▁villages ▁were ▁re develop ed ▁according ▁to ▁Roman ▁standards , ▁and ▁several ▁cities ▁were ▁created . ▁These ▁cities ▁are ▁Cond ate ▁( R ennes ), ▁V org ium ▁( Car ha ix ), ▁D ari or it um ▁( V