Ja'far ibn Ali () was a son of Ali and Umm al-Banin. He was named by Ali after the latter's brother, Ja'far ibn Abi Talib. The younger Ja'far was one of the companions of Husayn in the Battle of Karbala, where he was martyred on Ashura alongside his brothers Abbas, Abdullah and Uthman.Absar al-Ein, P. 69Manaagheb ibn Shahr Aashub, Vol. 4, P. 107-116Dinawari, al-Akhbar al-Tiwal, P.337Mufid al-Irshad, Vol. 2, P. 109 Abdullah and his brothers Abbas, Uthman, and Ja'far accompanied Husayn in his journey from Mecca to Kufa and were martyred at the Battle of Karbala. Their graves are in the mausoleum of the collective grave of the martyrs of Karbala in the Imam Husayn Shrine, a profoundly holy site in Shia Islam.
See also Descendants of Ali ibn Abi Talib Ashura Tasu'a Sermon of Ali ibn Husayn in Damascus Ziyarat Ashura Battle of Karbala Abbas ibn Ali Shia view of Ali
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