▁a ▁major ▁figure ▁in ▁the ▁ele vent h - century ▁Re con qu ista ▁in ▁Catal onia . ▁Arn au ▁is ▁sometimes ▁pra ised ▁as ▁the ▁" El ▁C id ▁of ▁the ▁Land s ▁of ▁L le ida " ▁for ▁his ▁found ational ▁role ▁in ▁re est ab lish ing ▁Christian ▁rule ▁in ▁the ▁region ▁to ▁the ▁south ▁of ▁Ur g ell . ▁ ▁Arn au ▁was ▁born ▁at ▁T ost ▁shortly ▁after ▁the ▁year ▁ 1 0 0 0 . ▁His ▁father ▁died ▁when ▁he ▁was ▁still ▁young ▁and ▁he ▁became ▁attached ▁to ▁the ▁court ▁of ▁Count ▁Er m eng ol ▁II . ▁In ▁ 1 0 3 1 ▁he ▁married ▁Ar send a ▁( or ▁Er send a ) ▁and ▁purchased ▁from ▁the ▁count ▁the ▁rights ▁to ▁the ▁castle ▁of ▁L l ord à ▁on ▁the ▁front ier ▁with ▁the ▁C ali ph ate ▁of ▁C ór dob a . ▁From ▁his ▁base ▁at ▁L l ord à ▁he ▁began ▁a ▁career ▁of ▁con quest ▁in ▁the ▁after math ▁of ▁the ▁break up ▁of ▁the ▁cal i ph ate ▁in ▁numerous ▁pet ty ▁ ṭ aw ā ' if . ▁He ▁conquer ed ▁the ▁Con ca ▁D ell à ▁and ▁brought ▁the ▁front ier ▁of ▁Ur g ell ▁up ▁to ▁the ▁mountain ous ▁region ▁of ▁Mont sec . ▁His ▁crow ning ▁achiev ement ▁was ▁to ▁se ize ▁the ▁mighty ▁q a ṣ ab ah ▁() ▁of ▁A j ī ra ▁ ▁( À ger ) ▁in ▁ 1 0 3 4