The new caliph had a pronounced "headstrong and vindictive personality", according to
Dominique Sourdel, which made itself felt soon after his accession, when he tortured his brother's sons and officials, as well as al-Muqtadir's mother
Shaghab, to extract their fortune. He was more energetic than his predecessor and cultivated an image of austerity and puritanism at his court, in deliberate contrast to the extravagantly dissolute life led by al-Muqtadir, but behind the scenes he too indulged in drunkenness. Trying to counteract the influence of Mu'nis and of the
vizier Ibn Muqla, who controlled government, and re-assert the power of his office, al-Qahir resumed contacts with the defeated court faction through
Muhammad ibn Yaqut. This alarmed Mu'nis and his supporters, but they were too late. In July 933, al-Qahir struck: the plans of the chamberlain
Ibn Yalbaq to depose him were thwarted, and he and Mu'nis were arrested and executed, while Ibn Muqla was forced to flee the capital. Al-Qahir appointed
Muhammad ibn al-Qasim ibn Ubayd Allah as vizier. Al-Qahir embarked on a firmly anti-
Shi'a policy, declaring himself the "Avenger of the enemies of the Faith" (
al-muntaqim min aʿdāʾ dīn Allāh), a slogan which he even put on his coins. Despite his support of the Caliph's anti-Shi'a policies, Muhammad ibn al-Qasim was soon dismissed in favour of
Ahmad al-Khasibi. Like his predecessor, however, al-Khasibi was unable to overcome the mounting financial crisis of the state. The contemporary Baghdadi historian
al-Mas'udi, in his
Meadows of Gold, reports that "His fits of violence made him the fear and terror of his subjects". He went about armed with a lance, striking down those who displeased him. However, the very "inconstancy of his behaviour and the horror inspired by his rages" alienated the populace and the court alike, and prepared the ground for his downfall. ==Downfall and death==