Özet:

The invasion movements carried out by the Mongols over the Balkans on the one hand and Anatolia on the other, upset the political balances between the states in these regions. One of these states is the Iznik Greek Empire, one of the heirs of the Byzantine Empire with diplomatic maneuvering capability. Iznik Greek Empire after the 1243 Kösedağ which took place in Turkey and the Seljuks defeated the War has tried to adapt to the new political balance. Mongols who consider themselves a serious threat to the Seljuks in Turkey in terms of Iznik Greek Empire Ioannes Vatatzes III. (1222-1254) as the first job Seljuk He signed an alliance agreement with Sultan Gıyaseddin Keyhüsrev II. (1237-1245). Not satisfied with this, the emperor created a buffer zone by placing the Cumans, who escaped from the Mongols, around the Menderes Valley and Kütahya. Mongol invasion of been instrumental in the formation of new balances in terms of financial as well as political terms, there was an increase in trade relations between Turkey Iznik Greek Empire and the Seljuks. In this study, how the Mongol invasion was perceived by the Iznik Greek Empire and what kind of steps the Emperor Ioannes Vatatzes took against this invasion will be examined.

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