, a town in the mediaeval Islamic province of northern D̲j̲ibāl some 50 km/32 miles to the southeast of Zand̲j̲ān [q.v.] (lat. 36° 24′ N., long. 48° 50′ E.).
1. History.
Sulṭāniyya was founded towards the end of the 7th/13th century by the Mongol Il K̲h̲ānids and served for a while in the following century as their capital. The older Persian name of the surrounding district was apparently S̲h̲āhrūyāz or S̲h̲ārūyāz/S̲h̲arūbāz (which was to be the site, adjacent to Sulṭāniyya, of the tomb which the Il K̲h̲ānid Abū Saʿīd [q.v.] built for himself, according to Ḥāfiẓ-i Abrū). It was orig…