Al-Muntasir

Abu Ja'far Muḥammad ibn Ja'far ibn Muḥammad ibn Hārūn al-Muntasir biʾLlāh (Arabic: أبو جعفر محمد; November 837 – 7 June 862), better known by his regnal title al-Muntasir biʾLlāh (المنتصر بالله, "He who triumphs in God") was the caliph of the Abbasid Caliphate from 861 to 862, during the "Anarchy at Samarra". The power struggle between al-Muntasir and his brother, al-Mu'tazz, backed by different factions, climaxed with the Turkic leaders plotting the murder of his father al-Mutawakkil. Following the assassination in 861, al-Muntasir assumed the caliphate with Turkic support.

He adopted a more favorable policy toward Shia Muslims than his father. He relaxed several restrictions imposed on the Alids, permitted visitation to the Imam Husayn Shrine in Karbala, and restored some property and privileges to members of the Alid family, including Fadak. He also maintained a favorable relationship with Ali al-Hadi, the tenth of the Twelve Imams. Al-Muntasir engaged in military actions against the Byzantines, led by his general Wasif al-Turki, but his sudden death in June 862 resulted in a change of leadership, and al-Musta'in succeeded him as caliph. The military campaign continued briefly, with Wasif achieving success before returning to Samarra due to the change in government.

Source: Wikipedia — https://en.wikipedia.org/wiki/Al-Muntasir