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Usual_World4332 t1_ixwuchl wrote

After the conquest of Constantinople, Mehmed claimed the title of caesar of the Roman Empire (Qayser-i Rûm), based on the assertion that Constantinople had been the seat and capital of the Roman Empire since 330 AD, and whoever possessed the Imperial capital was the ruler of the Empire.

In the mind of George of Trebizond, it was the possession of Constantinople that made Mehmed the legitimate Roman emperor: "no one can doubt that he is emperor of the Romans. He who holds the seat of empire in his hand is emperor of right; and Constantinople is the centre of the Roman Empire

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