text: A manifesto named for this city declared that the dynasty of Sultan al-Hakim was of Jewish descent andwas thus illegitimate.
full_question: A manifesto named for this city declared that the dynasty of Sultan al-Hakim was of Jewish descent andwas thus illegitimate. This city was the headquarters of an inquisition called the Mihna, which punishedopponents of the Mu'tazilite school. A family descended from Buddhist priests, the Barmakids, heldpower in this city. During an event in this city, a river here supposedly ran black with ink and its leaderwas rolled up in a carpet and (*) trampled by horses. The Banu Musa brothers and the mathematician alKhwarizmiworked in this city's House of Wisdom. Hulagu Khan sacked this city in 1258, ending its rule by adynasty that had included al-Mansur and Harun al-Rashid. For 10 points, name this capital of the Abbasid caliphateand of modern-day Iraq.
first_sentence: A manifesto named for this city declared that the dynasty of Sultan al-Hakim was of Jewish descent andwas thus illegitimate.
raw_answer: Baghdad, Iraq