Original: Shi'a view Shi'a view that Ali, the prophet of Islam's son-in-law and the progenitor of Muhammad's only continuing lineage, was given the title during Muhammad's era.
Simplified: Views of Sunni and Shi'a Sunni view that Umar was the first person to be given the title. Shi'a view that Ali, the prophet of Islam's son-in-law and the only person to father the prophets only continuing lineage, was given the title during Muhammad's era.