Al-Abbas ibn Ali (العباس بن علي‎, romanized: al-‘Abbās ibn ‘Alī), also known as Qamar Banī Hāshim (Arabic: قمر بني هاشم) (the moon of Banu Hashim) (born 4th Sha‘bān 26 AH – 10 Muharram 61 AH; approximately May 15, 647 – October 10, 680), was a son of Imam Ali, the first Imam of Shia Muslims and the fourth Caliph of Sunni Muslims, and Fatima bint Hizam, commonly known as Mother of the Sons (Arabic: أم البنين‎).
Abbas, also known as Abbas Alamdar, is highly revered by Shia Muslims and Sunni Muslims for his loyalty to his half-brother Husain, his respect for the Household of Muhammad, and his role in the Battle of Karbala. Abbas is buried in the Shrine of Abbas in Karbala, Karbala Governorate, Iraq, where he was martyred during the Battle of Karbala on the day of Ashura.