One of the volumes of the "Jāmiʿ al-Tawārīkh" deals with an extensive "History of the Franks" (1305/1306), possibly based on information from Europeans working under the Ilkhanates such as Isol the Pisan or the Dominican friars, which is a generally consistent description with many details on Europe's political organization, the use of "mappae mundi" by Italian mariners and regnal chronologies derived from the chronicle of Martin of Opava (d. 1278).