Abbas ibn Ali (Arabic: العباس بن علي) (fourth of Shabaan 26th A.H., at Medina - tenth of Muharrum 61 A.H., at Karbala) was the son of the fourth sunni Caliph and the first Shi'ah Imam, Ali ibn Abu Talib and Fatima binte Hizam, commonly known as Ummul Baneen. Abbas is particularly revered by Shi’a Muslims for his loyalty to his half-brother and third Shi’a Imam, Hussain ibn Ali, his respect for the Ahl al-Bayt, and his role in the battle of Karbala. Abbas was married to Lubaba binte Obaidullah ibn Abbas ibn Abdul Muttalib.