Uthman ibn Ali () was a son of Ali and Umm al-Banin. He fought in the Battle of Karbala alongside his brother Husayn, in which he was martyred. Uthman is highly honored by Muslims for his sacrifice. According to some sources Uthman was 21 and had no children when he was martyred.
Uthman and his brothers Abbas, Abdullah, 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.
Biography He was the son of Ali and Fatima bint Hizam.Iṣfahānī, Maqātil al-ṭālibīyyīn, p. 89. Apparently, 'Uthman did not get married and had no children.Madinat Dimashq by ibn `Asakir 45/304 In a Shi'a narration, Ali named his son Uthman after Uthman ibn Maz'un.al-Amali al-Ithneeniyyah 1/488
Uthman's mother, Fatima, was the daughter of Hizam ibn Khalid ibn Rabi'a from the Arab tribe of Banu Kilab. She was the mother of three more sons of Ali, namely Abbas, Abdullah, and Ja'far, and for this reason she became known as Umm al-Banin.
Death Uthman went to the battlefield saying: "I am Uthman the possessor of glory, my master is Ali the executor of virtuous deeds, this is Husayn the master of fairness, the master of the young and old". Khawli ibn Yazid al-Asbahi shot an arrow at Uthman's forehead resulting in him falling off his horse. Then a man from the Banu Darim tribe beheaded him.
Uthman ibn Ali was 21 years old when he was killed on the day of Ashura. His grave is in the shrine of Husayn.
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