ate ▁of ▁the ▁Bed ou in ) ▁and ▁appointed ▁Had ith a ▁ibn ▁Gh ud ay ya ▁as ▁the ▁first ▁am ir ▁al - ʿ arab . ▁Had ith a ▁was ▁a ▁grand son ▁of ▁the ▁Jar rah id ▁em ir ▁F ad l ▁ibn ▁Rab i ' ah , ▁the ▁pro gen itor ▁of ▁the ▁Al ▁F ad l ▁cl an ▁of ▁Ban u ▁Rab i ' ah . ▁M embers ▁of ▁the ▁cl an ▁were ▁direct ▁descend ants ▁of ▁the ▁F at im id - era ▁Jar rah id ▁governor ▁of ▁Palest ine , ▁M uf ar rij ▁ibn ▁D agh fal ▁ibn ▁al - J ar rah ▁( d . ▁ 1 0 1 3 ). ▁By ▁the ▁late ▁ 1 2 th ▁century , ▁the ▁Ban u ▁Rab i ' ah ▁and ▁its ▁sub - cl ans , ▁Al ▁F ad l , ▁Al ▁Mira ▁and ▁Al ▁Far aj , ▁together ▁with ▁other ▁sub - cl ans ▁of ▁its ▁ancest ral ▁tribe , ▁the ▁T ay y , ▁domin ated ▁the ▁desert ▁and ▁ste ppe ▁regions ▁between ▁H oms ▁in ▁the ▁west ▁to ▁the ▁eastern ▁banks ▁of ▁the ▁Eu phr ates ▁River ▁and ▁south ward ▁to ▁central ▁Naj d ▁and ▁He j az . ▁However , ▁despite ▁their ▁influence , ▁the ▁M aml uk ▁historian ▁al - H amd ani ▁( d . ▁ 1 3 0 0 ) ▁maintain s ▁that ▁" no ▁member ▁of ▁this ▁cl an ▁[ B anu ▁Rab i ' ah ] ▁was ▁appointed