Nuzhat al-Qulub

[5] The Nuzhat al-Qulub is considered Mustawfi's most prominent work and is virtually the only source to describe the geography and affairs of the Mongol Ilkhanid Empire.

The source gives vital information about the government, commerce, economic life, sectarian conflicts, tax-collection and other similar topics.

However, it did remain as an element of the national sentiment of the Iranians, and was occasionally mentioned in the works of other people.

[9] According to the modern historian Peter Jackson (2017), the reason behind this resurgence was the fall of the Abbasid Caliphate in 1258 and the "relative disenfranchisement of political Islam.

[12] Mustawfi describes the borders of Iran extending from the Indus River to Khwarazm and Transoxiana in the east to Byzantium and Syria in the west, corresponding to the territory of the Sasanian Empire.