This city was founded when a ruler arrived at the confluence of two rivers and proclaimed the building of a perfectly round "City of Peace.
This city was founded when a ruler arrived at the confluence of two rivers and proclaimed the building of a perfectly round "City of Peace." Doquz sought to spare Christians during one siege of this city. The first paper mill was supposedly founded in this city by members of the Barmakid family. A ruler from this city tried to impose the doctrine of Mu'tazila by using courts called  mihna   (MIKH-nuh) . After one event in this city, a river supposedly ran (*)  black with ink and its ruler was trampled in a carpet. A center for scholarship in this city was home to the developer of algebra, al-Khwarizmi, and was founded by al-Ma'mun. This city was devastated when its House of Wisdom was destroyed during a sacking by Hulagu Khan. For 10 points, name this capital of the Abbasid caliphate.
This city was founded when a ruler arrived at the confluence of two rivers and proclaimed the building of a perfectly round "City of Peace.
Baghdad 