Ja'far b. al-Imam al-Hadi (a)
|Ja'far b. al-Imam al-Hadi|
|Teknonym||Abu 'Abd Allah|
|Well-known As||Ja'far al-Kadhdhab|
|Well-known Relatives||Imam al-Hadi (a) (father), Imam al-'Askari (a) (brother)|
|Place of Birth||Medina|
|Places of Residence||Medina, Samarra|
Jaʿfar b. ʿAli b. Muḥammad (226/841-271/884) (Arabic: جعفر بن علی بن محمد) known as Ja'far al-Kadhdhab (Arabic: جعفر الکذّاب, Ja'far the Liar) was the son of Imam al-Hadi (a) and brother of Imam al-Hasan al-'Askari (a). After the martyrdom of his bother, Ja'far claimed Imamate and attracted a group of Shi'a for a while. His followers believed Imam al-Hasan al-'Askari (a) had left no son; therefore, his brother would succeed him after his martyrdom. According to some accounts, Ja'far actually regarded himself the successor of his father, Imam al-Hadi (a), and had claimed Imamate before the martyrdom of his brother, Imam al-'Askari (a). His followers are called "Ja'fariyya".