▁annual ▁value ▁of ▁which ▁was ▁ 2 4 0 , 0 0 0 ▁ak ç e . ▁This ▁formed ▁part ▁of ▁the ▁s ultan ' s ▁re venue ▁from ▁the ▁Dam asc us ▁E y alet . ▁ ▁History ▁ ▁Orig ins ▁The ▁Sy rian ▁Des ert , ▁which ▁extended ▁from ▁B alis ▁to ▁Ay la , ▁had ▁been ▁inhab ited ▁by ▁Bed ou in ▁( nom adic ▁Arab ) ▁tribes ▁since ▁pre - I sl am ic ▁times ▁( before ▁mid - 7 th ▁century ). ▁Through out ▁the ▁ 2 5 0 ▁years ▁following ▁the ▁Muslim ▁con quest ▁of ▁Sy ria ▁in ▁the ▁ 6 3 0 s , ▁the ▁Bed ou in ▁were ▁brought ▁under ▁the ▁authority ▁of ▁the ▁R ash id un ▁( 6 3 2 – 6 6 1 ), ▁Um ay y ad ▁( 6 6 1 – 7 5 0 ) ▁and ▁early ▁Abb as id ▁( 7 5 0 – 8 6 1 ) ▁cal i ph ates . ▁However , ▁during ▁this ▁period , ▁certain ▁Bed ou in ▁tribes ▁also ▁participated ▁in ▁Um ay y ad ▁d yn astic ▁strugg les , ▁the ▁Abb as id ▁Revolution , ▁the ▁reb elli ous ▁K har ij ite ▁and ▁Al id ▁movements ▁and ▁isolated ▁revol ts . ▁Following ▁the ▁Abb as id ▁decl ine ▁beginning ▁in ▁ 8 6 1 , ▁state ▁authority ▁in ▁the ▁Sy rian ▁Des ert ▁re ced ed ▁significantly , ▁leaving ▁the ▁Bed ou in ▁tribes ▁to ▁fill ▁the ▁void . ▁The