D in ▁Z eng i , ▁followed ▁by ▁his ▁son ▁Nur ▁ad - D in ▁( ru led ▁ 1 1 4 7 – 1 1 7 4 ) ▁successfully ▁un ified ▁Ale ppo ▁and ▁Dam asc us ▁and ▁held ▁back ▁the ▁Cr us aders ▁from ▁their ▁repeated ▁assault s ▁on ▁the ▁cities . ▁Several ▁famous ▁cr us aders ▁were ▁imprison ed ▁in ▁the ▁cit adel , ▁among ▁them ▁Count ▁of ▁Ed essa , ▁Jos cel in ▁II , ▁who ▁died ▁there , ▁Ray n ald ▁of ▁Ch ât illon , ▁and ▁the ▁King ▁of ▁Jerusalem , ▁Bald win ▁II , ▁who ▁was ▁held ▁for ▁two ▁years . ▁In ▁addition ▁to ▁his ▁many ▁works ▁in ▁both ▁Ale ppo ▁and ▁Dam asc us , ▁Nur ▁ad - D in ▁re built ▁the ▁Ale ppo ▁city ▁walls ▁and ▁fort ified ▁the ▁cit adel . ▁Arab ▁sources ▁report ▁that ▁he ▁also ▁made ▁several ▁other ▁improvements , ▁such ▁as ▁a ▁high , ▁brick - w alled ▁entrance ▁r amp , ▁a ▁palace , ▁and ▁a ▁race course ▁likely ▁covered ▁with ▁grass . ▁Nur ▁ad - D in ▁addition ally ▁restored ▁or ▁re built ▁the ▁two ▁mos que ▁and ▁don ated ▁an ▁elaborate ▁wooden ▁mi h rab ▁( p ray er ▁n iche ) ▁to ▁the ▁Mos que ▁of ▁Abraham . ▁The ▁mi h rab ▁disappeared ▁during ▁the ▁French ▁Mand ate . ▁ ▁Sal adin ' s ▁son ▁al - Z ah ir ▁al - G h azi ▁ruled ▁Ale ppo ▁between ▁ 1 1 9 3 ▁and