Jafar ibn Ali al-Hadi

Abū ʿAbd Allāh Jaʿfar ibn ʿAlī al-Hādī (; 226-271 A.H., CE – CE), also derisively known as al-Kadhdhāb in Twelver Shi'ism, was the third son of the tenth Twelver Shi'a Imam, Ali al-Hadi. He claimed to be an imam and established his own sect of followers, to whom he was known as al-Zakī .

Family Jafar b. Ali b. Muḥammad was the son of the tenth Imam, Ali al-Hadi and the brother of eleventh Imam Hasan al-Askari. Also, he had one older brother, Muhammad who died before his father's death.

Challenge After the death of Ali al-Hadi After the death of Ali al-Hadi, Jafar b. Ali claimed Imamate. Twelvers believed that he was immoral. Baháʼís believe that he was a truthful person.

In his defense, his followers claimed that his personality had changed from his youth. He claimed that his brother never had a son.