Shi'a Islam, also known as Shi'ite Islam or Shi'ism, is the second largest branch of Islam after Sunni Islam. Shias adhere to the teachings of Muhammad and the religious guidance of his family (who are referred to as the Ahl al-Bayt) or his descendants known as Shia Imams.
originated as a response to questions of Islamic religious leadership which became manifest as early as the death of Muhammad in 632 CE. The issues involved not only whom to appoint as the successor to Muhammad, but also what attributes a true successor should have.
When did Shia start?
The first part was the emergence of the Shia, which starts after Muhammad's death in 632 and lasts until Battle of Karbala in 680. This part coincides with the Imamah of Ali, Hasan ibn Ali and Hussain.
When did Sunni begin?
The Aftermath of Muhammad's Death
The roots of the Sunni-Shia divide can be traced all the way back to the seventh century, soon after the death of the prophet Muhammad in A.D. 632.
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