Al-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 Abi Talib and
Fatima bint Hizam, commonly known as Ummul Banin. Al-Abbas is particularly revered by Shi’a Muslims for his loyalty to his half-brother and third Shi’a Imam,
Husayn ibn Ali, his respect for the
Ahl al-Bayt, and his role in the
battle of Karbala. Al-Abbas was married to
Lubaba bint Ubaydillah ibn Abbas ibn Abdil Muttalib. He had three sons, and their names are
al-Fadl ibn al-Abbas,
Qasim ibn al-Abbas, and
Ubaydullah ibn al-Abbas. Two of them were killed during the Battle of Karbala. The family lineage of Al-Abbas ibn Ali was succeeded by
Ubaydullah ibn al-Abbas. Ubaydullah then had five sons: Abdullah ibn Ubaydillah, Abbas ibn Ubaydillah,
Hamza ibn Ubaydillah,
Ibrahim ibn Ubaydillah, and
al-Fadl ibn Ubaydillah.
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