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Musa ibn Bugha al-Kabir -LRB- died 877 -RRB- was an Abbasid military leader of Turkic origin .. Abbasid. Abbasid. Turkic. Turkic peoples. Bugha al-Kabir. Bugha al-Kabir. Musa was the son of Bugha al-Kabir , one of the leading Turkish generals under Caliph al-Mu ` tasim -LRB- r. 833 -- 842 -RRB- .. Bugha al-Kabir. Bugha al-Kabir. He may have participated in or at least organized the assassination of Caliph al-Mutawakkil in 861 .. al-Mutawakkil. al-Mutawakkil. Upon Bugha 's death in 862 , Musa succeeded his father in his offices and played an important role in the troubles of the `` Anarchy at Samarra '' .. Anarchy at Samarra. Anarchy at Samarra. Finally , he emerged victorious , and through his close association with the vizier and regent Abu Ahmad al-Muwaffaq , he became the most powerful general of the Abbasid Caliphate from 870 until his own death in 877 .. Abbasid. Abbasid. Abu Ahmad al-Muwaffaq. Abu Ahmad al-Muwaffaq. His sons Ahmad , Muhammad and al-Fadl likewise became senior military figures of the Caliphate , especially against the Zanj Rebellion .. Zanj Rebellion. Zanj Rebellion