The Nāṣirī Generations 36: I. ABU-L-HASAN, SON OF BUWIAH, UD-DILAMI.

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He bore the title of Fakhr-ud-Daulah; and he first rose to power and dominion, from the time that he was Amir [lord] of Ahwaz, when the Turks of Baghdad, whose chief and commander was Tuzun, seized the person of the Lord of the Faithful, Al-Muttaki B'illah, and deprived him of his sight, set him aside, and fixed a stipend for his support. Having done this, Tuzun set up the dethroned Khalifah's son, Al-Mustakfi B'illah, in his stead, while Tuzun himself became Amir-ul-Umra and assumed the direction of the whole of the affairs of the Khilafat.
Abu-l-Hasan, son of Buwiah, assembled the troops of Dilam, and marched towards Baghdad; and for a period of four months carried on hostilities with the Turks, at the expiration of which time the Turks were defeated, and put to flight. Abu-l-Hasan took possession of Baghdad, and his commands were obeyed in all matters respecting the government of the territory, and the Khilafat. A party of spies informed him, however, that the Khalifah, Al-Mustakfi, meditated treachery towards him, in order to get him into his power, and intended to put him to death if he succeeded in doing so. Abu-l-Hasan, however, determined to be beforehand and to anticipate his intention, and seized the person of the Lord of the Faithful, Al-Mustakfi B'illah, blinded him, and set up the Khalifah, Al-Muti'u-L'illah in his stead. According to the historian Ut-Tabari, he gave himself the title of Mu'izz-ud-Daulah, and took the whole power in the State into his own hands so that Al-Muti'u-L'illah was Khalifah only in name, while he ruled the country, issued his mandates, and exercised the supreme authority over the Khilafat.
Abu-l-Hasan, son of Buwiah, instituted many excellent regulations which he carried out; and he caused the whole of the depopulated and dilapidated parts of Baghdad to be restored and rendered habitable. He also abolished a custom whereby each quarter of the city possessed a separate prison of its own, and had them all demolished. On the son of Abu-l-Hayja he conferred the fief of Musil, and to his brother, 'Ali, son of Buwiah, he gave the title of 'Imad-ud-Daulah, and to another brother, Hasan, that of Rukn-ud-Daulah; and day by day the sovereignty of the family of Buwiah began to prosper uninterruptedly.