Ибн Хордадбех
Mustawfi's most prominent work is the "Nuzhat al-qulub" ("Hearts' Bliss"), which is virtually the only source to describe the geography and affairs of the Ilkhanate era. The source gives vital information about the government, commerce, economic life, sectarian conflicts, tax-collection and other similar topics. Just like his "Tarikh-i guzida" and "Zafarnamah", Mustawfi rejects to have expertise in the field, and states that he was encouraged by his friends to write the work. He also thought that an available source in Persian would be helpful, due to most geographical sources about Iran being in Arabic (such as the works of Abu Zayd al-Balkhi and Ibn Khordadbeh).