Abū ʿAbd Allāh Jaʿfar ibn ʿAlī al-Hādī (Arabic: أبو عبد الله جعفر بن علي الهادي; 226-271 A.H., c. 840 CE – c. 885 CE), also derisively known as al-Kadhdhāb (Arabic: الکَذّاب, lit.
He claimed to be an imam and established his own sect of followers, to whom he was known as al-Zakī (Arabic: الزكي, lit.
Also, he had one older brother, Muhammad who died before his father's death.
[1][2] Baháʼís believe that he was a truthful when he said that Hasan Al-Askari had a son that died.
[3] In his defense, his followers claimed that his personality had changed from his youth.