adel ▁could ▁be ▁filled ▁from ▁these ▁streams . ▁Another ▁branch ▁of ▁the ▁Bar ada , ▁the ▁N ahr ▁B any as , ▁entered ▁the ▁city ▁under ▁the ▁cit adel . ▁H yd ra ul ic ▁structures ▁below ▁that ▁made ▁control ▁of ▁the ▁flow ▁of ▁water ▁into ▁Dam asc us ▁possible ▁from ▁within ▁the ▁cit adel ▁were ▁probably ▁constructed ▁under ▁Al - Ad il . ▁The ▁cit adel ▁was ▁fully ▁integrated ▁into ▁the ▁def ences ▁of ▁Dam asc us , ▁with ▁the ▁city ▁walls ▁ab ut ting ▁the ▁cit adel ▁on ▁its ▁south west ▁and ▁n ortheast ▁corners . ▁ ▁The ▁cit adel ▁ere cted ▁under ▁the ▁Sel ju q s ▁occupied ▁an ▁area ▁meas uring ▁. ▁Part s ▁of ▁the ▁Sel ju q ▁walls ▁were ▁integrated ▁in ▁the ▁re building ▁undert aken ▁by ▁Al - Ad il . ▁In ▁this ▁way , ▁a ▁second ▁inner ▁ring ▁of ▁defence ▁was ▁provided , ▁as ▁Al - Ad il ' s ▁walls ▁en closed ▁a ▁slightly ▁larger ▁area . ▁The ▁A yy ub id ▁cit adel ▁en clos es ▁an ▁une ven ▁rect angular ▁area ▁of ▁. ▁The ▁outer ▁walls , ▁constructed ▁by ▁Al - Ad il , ▁were ▁pier ced ▁by ▁three ▁gates ▁and ▁originally ▁protected ▁by ▁ 1 4 ▁to wers , ▁although ▁only ▁ 1 2 ▁of ▁these ▁remain . ▁Ex cept ▁for ▁the ▁western ▁part ▁of ▁the ▁cur tain ▁wall , ▁the ▁def ensive ▁works ▁of ▁the ▁cit adel ▁that ▁are ▁still ▁standing ▁are ▁primarily ▁of ▁A yy ub id ▁date ,