The Nāṣirī Generations 38: III. BAKHTYAR, SON OF AL-HASAN, SON OF BUWIAH, DILAMI.

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On the death of his father he took possession of Baghdad, and directed the affairs of government after the manner of his father, and acquired great power and dominion.
As soon as he had become firmly established in his authority, the Khalifah, Al-Muti'u-L'illah, preferred a request to him respecting the sedition and discord caused by the Karamitah sect of schismatics, which had assumed great proportions throughout the empire of Islam, and urged him to assemble forces and suppress them, and uproot them utterly. Bakhtyar, however, did not pay attention to the solicitations of the Khalifah, and, consequently, enmity arose between them. Matters assumed such an aspect that Bakhtyar was not safe from the designs of Al-Muti'u-L'illah; and the informers of Bakhtyar warned him that the Khalifah meditated treachery towards him. Bakhtyar sought his opportunity, according to the statement contained in the History of Ibn-Haisam, and assembled together all the Kazis and 'Ulama—judges, lawyers, and ecclesiastics—and transferred the office of Khalifah to the son of Al-Muti’u-L’illah whose name was Abu-Bikr-i-’Abd-ul-Karim, and gave him the title of Ut-Ta’i’u-L’illah. As soon as he was installed in the Khilafat, he gave his daughter in marriage to Bakhtyar, Buwiah, and he became the chamberlain and lieutenant of the Khilafat.
Soon after this dignity was conferred upon Bakhtyar, he set out for Ahwaz in order to levy the revenues and taxes. Sabuk-Tigin, Chashni-gir [cup-bearer or taster] who was Bakhtyar's deputy, began to act insubordinately towards his master, and took the power out of his hands.