ay rid s ▁of ▁Ira q , ▁having ▁already ▁secret ly ▁secured ▁the ▁defe ction ▁of ▁the ▁province ' s ▁leading ▁trib al ▁chief s , ▁and ▁defeated ▁Ira q ' s ▁r uler , ▁I bn ▁al - Z ub ay r ' s ▁brother ▁Mus ' ab , ▁at ▁the ▁Battle ▁of ▁M ask in ▁in ▁ 6 9 1 . ▁After ward , ▁the ▁Um ay y ad ▁commander ▁al - H aj j aj ▁ibn ▁Y us uf ▁bes ie ged ▁Me cca ▁and ▁killed ▁I bn ▁al - Z ub ay r ▁in ▁ 6 9 2 , ▁mark ing ▁the ▁end ▁of ▁the ▁Second ▁F it na ▁and ▁the ▁reun ification ▁of ▁the ▁C ali ph ate ▁under ▁Abd ▁al - Mal ik ' s ▁rule . ▁ ▁Cons olid ation ▁and ▁expansion ▁ ▁The ▁second ▁major ▁event ▁of ▁the ▁early ▁reign ▁of ▁Abd ▁al - Mal ik ▁was ▁the ▁construction ▁of ▁the ▁D ome ▁of ▁the ▁Rock ▁in ▁Jerusalem . ▁Although ▁the ▁chron ology ▁remains ▁somewhat ▁uncertain , ▁the ▁building ▁seems ▁to ▁have ▁been ▁completed ▁in ▁ 6 9 2 , ▁which ▁means ▁that ▁it ▁was ▁under ▁construction ▁during ▁the ▁conflict ▁with ▁I bn ▁al - Z ub ay r . ▁This ▁had ▁led ▁some ▁histor ians , ▁both ▁medieval ▁and ▁modern , ▁to ▁suggest ▁that ▁the ▁D ome ▁of ▁the ▁Rock ▁was ▁built ▁as ▁a ▁destination ▁for ▁pil gr image ▁to ▁rival ▁the ▁Ka aba , ▁which ▁was ▁under ▁the ▁control ▁of ▁I bn ▁al