Sunnis say he named no successor; Shi'ites say he picked his son-in-law
[DOC] [TLE] Sunnis vs. Shi'ites - Discover the Networks [PAR] Ali, in turn, was assassinated in 661 AD, and his son Hussein (680 AD) died ... by 
Shiite Muslims, some of whom claim he was poisoned by the Sunni caliph 
Muawiyah.