Arabian historian and geographer, Ibnü Fazlillaahi'l-Ömerî had provided valuable information about the situation of Anatolia pertaining to the year of 1332. This date is considered as the last domination years of Ilhanli State in Anatolia. The Arabian historian states that: These Turkish forefront Bey principalities were based on the high mountains, castles and the belligerent elements. They were so powerful thanks to the abundance of their armies and weapons. They would deliver prayers in the name of Ilhanli State that is rooted from Hulagu lineage and they would mint coins in their name. They would present gifts to the regions of Ilhanli State in Anatolia and they would abstain from the Ilhanli State that these regents depended on. They would pay attention that the letters written by the regents to the Ilhan ruler would be in favour of them.
The same scholar had also provided valuable data and information pertaining to the population and armies of the Turkmen bey principalities in the year of 1332. According to these data, the population of the Turkmen bey principalities in the year of 1332 could be estimated and deduced as follows:
Osmanogullari principality 1.030.000, Karasiogullari principality 250.000 (both of them: 1.280.000), Karamanogullari principality 750.000, Candarogullari principality 420.000, Hamîdogullari principality 380.000 (Isparta branch: 300.000, Antalya = Teke branch: 80.000), Saruhanogullari principality 280.000, Menteshogullari principality 170.000, Inancogullari principality (Denizli Bey principality) 100.000, Esrefogullari principality (Beysehir Bey principality) 70.000, Gazi Celebî's Sinop Bey Principality 70.000, total: 5.020.000.
Apart from the Turkmen bey principalities, we can estimate the population of the Anatolian lands pertaining to the Ilhanli State, Mameluke State, Trebizond and Cilicia States, the Byzantine and Latins as 6-7 millions of people in this period (Istanbul and the Thrace is not included in this estimation). It can be understood with a rough estimation that the population living in the lands of todays Turkey was nearly 13 millions of people in the second quarter of the century XIV. The historical situations also approved this information. In the same period, the population of England was approximately 2.5 millions and the population of France was nearly 12,5 millions of people (todays borders). Therefore, the population of Turkey and the population of France that was absolutely the most crowded country of Europe were equal in the century XIV. It should be added that the population of Turkey must necessarily have been higher and at least within the range of 15-16 millions in the middle of the century XIII. It is an absolute fact that the population of Turkey had been diminished under the domination of Mongolians. In this case, the population of any country or any state in Europe (for example, the population of France or Germany or Russia considering todays borders) was not even near to the population of Turkey. However, the same situation could also be stated for Turkey Khanate, in other words, the Anatolian Seljuks State. It is beyond doubt that the population of Turkey in the century XIII had exceeded the population of Rome and the first Byzantine era in which the Anatolia was the highest prosperous state.