10.2 Umayyad's and Abbasids By Reid_Wenisch Jan 1, 632 Muhammad dies, Abu Bakr becomes first caliph Jan 1, 634 Abu- Bakr dies Jan 1, 661 Umayyads take power Jan 1, 750 Abbasids overthrow the Umayyads Jan 1, 762 Abbasids move Muslim capital from Damascus to Baghdad Jan 1, 1258 Abbasids lose power