al-Muwaffaq (English spelling) alMuwaffaq

...Their forces, mainly from Zanj, twice invaded Ahwaz and briefly occupied Wasit in central Iraq. At the time, the Abbasid Caliphate was dominated by the Mamluks, and there was constant conflict and strife between the warlords, leading to a state of near anarchy. However, things started to improve when the caliph's brother, general al-Muwaffaq (?-891), took control of the country. Muwaffaq personally led an army against the rebels, gradually driving them into a corner, and the rebellion ended with the fall of the capital, Mukhtala, and the death of Ali.

*Some of the terminology explanations that mention "al-Muwaffaq" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…ザンジュを主力とするその軍は，2度アフワーズに進攻し，また中部イラクのワーシトを一時占領した。当時のアッバース朝はマムルーク軍団が政治を壟断し，軍閥間の対立･抗争が絶えず，無政府状態に近かったが，カリフの弟で将軍ムワッファクal‐Muwaffaq(？‐891)が実権を握るに及んで立ち直ってきた。ムワッファクは自ら軍を率いて反乱軍に反撃し，反乱軍はしだいに追いつめられ，首都ムフターラの陥落とアリーの死をもって反乱は終わった。…

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出典｜株式会社平凡社世界大百科事典 第２版について | 情報