▁was ▁re built ▁and ▁the ▁northern ▁wall ▁was ▁moved ▁ ▁to ▁the ▁north . ▁More ▁re building ▁was ▁completed ▁during ▁the ▁reign s ▁of ▁the ▁s ultan ▁Q al aw un ▁( 1 2 7 9 – 1 2 9 0 ) ▁and ▁Al - A sh raf ▁K hal il . ▁ ▁The ▁latter ▁had ▁a ▁structure ▁called ▁the ▁Blue ▁D ome ▁built ▁in ▁the ▁cit adel . ▁It ▁was ▁the ▁first ▁d ome ▁in ▁Sy ria ▁that ▁was ▁decor ated ▁with ▁col oured ▁t iles ▁on ▁the ▁outer ▁surface , ▁a ▁tradition ▁imported ▁from ▁Iran . ▁Following ▁the ▁M aml uk ▁defeat ▁in ▁the ▁Battle ▁of ▁W adi ▁al - K h az and ar , ▁Dam asc us , ▁except ▁for ▁the ▁cit adel , ▁changed ▁hands ▁to ▁the ▁Mong ols ▁in ▁ 1 3 0 0 . ▁The ▁Mong ols ▁bes ie ged ▁the ▁cit adel ▁and ▁set ▁up ▁a ▁tre buch et ▁in ▁the ▁court ▁of ▁the ▁Um ay y ad ▁Mos que , ▁but ▁they ▁with d rew ▁from ▁Dam asc us ▁before ▁the ▁cit adel ▁could ▁be ▁taken . ▁In ▁the ▁following ▁dec ades , ▁extensive ▁reconst ruction ▁work ▁took ▁place ▁on ▁the ▁cit adel . ▁The ▁damage ▁done ▁to ▁the ▁cit adel ▁during ▁the ▁sie ge , ▁primarily ▁on ▁its ▁east ▁side , ▁was ▁rep a ired . ▁The ▁mos que ▁was ▁re construct ed ▁and ▁en larg ed , ▁the ▁to wers ▁were ▁rep a ired , ▁and ▁the ▁Blue ▁D ome ▁was ▁covered