ʿAbd Allah b. al-ʿAbbās (Arabic: عبد اللّه بن العباس), (b. 3 BH/619-20 - d. 68/687-8), commonly known as Ibn al-ʿAbbās, was the Prophet (s) and Imam 'Ali's (a) cousin and one of the companions to the Prophet (s), Imam Ali (a), Imam al-Hasan (a), and Imam al-Husayn (a).
Although Ibn al-'Abbas believed that Imam 'Ali (a) was the rightful caliph after the Prophet (s), he cooperated with the three caliphs. He was in Imam 'Ali's army during the battles of Jamal, Siffin, and Nahrawan. He was appointed as the governor of Basra by Imam 'Ali (a). After Imam 'Ali's (a) martyrdom, he supported Imam al-Hasan (a). In Imam al-Hasan's (a) funeral, he stopped Banu Hashim and Banu Umayya from having fight.
He warned Imam al-Husayn (a) about traveling to Karbala, and did not accompanied him in that trip.
Many hadiths have been narrated form him in both Shi'a and Sunni sources. An exegesis of Qur'an, attributed to him, have been published many times. He is the ancestor of the Abbasid Caliphs. Read more...