Al-Mahdī al-ʿAbbāsī (b. 126/743-44 - d. 169/785-86) was the third Abbasid caliph who reached caliphate during the imamate of Imam al-Kazim (a). His rule began in 158/775 and ended in 169/785-86. Some sources, based on historical evidence, believe that Mahdawiyya and his father's goals were influential in titling him as al-Mahdi. In 159/775-76, he summoned Imam al-Kazim (a) to Baghdad and then imprisoned him for a while.
|Third 'Abbasid Caliph|
|Name||Muhammad b. 'Abd Allah|
|Teknonym||Abu 'Abd Allah|
|Reign||158/775 - 169/785-86|
|Contemporary with||Imam al-Kazim (a)|
|Activities||Sending armies to Roman Empire and India several times|
|Remnants||Developing roads which reached Mecca and expanding al-Masjid al-Haram|
At the beginning of his caliphate, al-Mahdi al-'Abbasi avoided to kill and torture Shi'a. He released imprisoned Shi'a and assigned allowance for them. During his rule, some rebellions were made which were suppressed by the government. He sent armies to Roman Empire and India several times.