oman ▁population ▁took ▁place , ▁ ▁( mu wall ad um ▁or ▁Mul adi ). ▁After ▁a ▁long ▁process , ▁sp ur red ▁on ▁in ▁the ▁ 9 th ▁and ▁ 1 0 th ▁centuries , ▁the ▁majority ▁of ▁the ▁population ▁in ▁Al - And alus ▁eventually ▁converted ▁to ▁Islam . ▁The ▁Muslim s ▁were ▁referred ▁to ▁by ▁the ▁generic ▁name ▁Mo ors . ▁The ▁Muslim ▁population ▁was ▁divided ▁per ▁eth nic ity ▁( A rab s , ▁Ber bers , ▁Mul adi ), ▁and ▁the ▁supre m acy ▁of ▁Arab s ▁over ▁the ▁rest ▁of ▁group ▁was ▁a ▁rec urrent ▁caus al ▁for ▁str ife , ▁rival ry ▁and ▁hat red , ▁particularly ▁between ▁Arab s ▁and ▁Ber bers . ▁Arab ▁el ites ▁could ▁be ▁further ▁divided ▁in ▁the ▁Y emen ites ▁( first ▁wave ) ▁and ▁the ▁Sy ri ans ▁( second ▁wave ). ▁Christians ▁and ▁Jews ▁were ▁allowed ▁to ▁live ▁as ▁part ▁of ▁a ▁strat ified ▁society ▁under ▁the ▁d him ma h ▁system , ▁although ▁Jews ▁became ▁very ▁important ▁in ▁certain ▁fields . ▁Some ▁Christians ▁migr ated ▁to ▁the ▁Northern ▁Christian ▁kingdom s , ▁while ▁those ▁who ▁stayed ▁in ▁Al - And alus ▁progress ively ▁arab ised ▁and ▁became ▁known ▁as ▁must a ' arab ▁( moz ar abs ). ▁The ▁slave ▁population ▁compr ised ▁the ▁ Ṣ a q ā lib a ▁( liter ally ▁meaning ▁" s lav s ", ▁although ▁they ▁were ▁slaves ▁of ▁generic ▁European ▁origin ) ▁as ▁well ▁as ▁Sud an ese ▁slaves .