Mustanṣiriyyah

…early 13th century) and the Mustanṣiriyyah madrasah (an Islamic law college built by the caliph al-Mustanṣir in 1233), both restored as museums, and the Sahrāwardī Mosque (1234). The Wasṭānī Gate, the only remnant of the medieval wall, has been converted into the Arms Museum.

…schools of jurisprudence, and the Mustanṣiriyyah in Baghdad was erected in 1233 to be a sort of ecumenical madrasah for the whole of Sunni Islam.