The Sunni-Shi'i Split
nThe Umayyad leader, Mu'awiya, was proclaimed caliph in 660.
nAli was assassinated in 661; his son, Husayn, was killed at Karbala in 680.
nThe dispute left permanent division within Islam.
nThe Shi’i, eventually dividing into many sects, continued to uphold the rights of Ali's descendants to be caliphs.