Question: Makbule Atadan was the sister of a Turkish army officer whose policies and theories became known as what?
Sentence (from "Anarchy at Samarra"): Divisions within the Turkish military leadership enabled Musta'in to flee to Baghdad in 865 with the support of some Turkish chiefs (Bugha the Younger and Wasif) and the Tahirids, but the rest of the Turkish army chose a new caliph in the person of al-Mu'tazz and besieged Baghdad, forcing the city's capitulation in 866.
Relevant evidence: No