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After the conquest of Constantinople Mehmed II claimed the title "Caesar" of the Roman Empire (Qayser-i Rûm).
The Germans KAISERS claimed the title of "Caesar"of Roman Empire
The Russian TZARS ( the most important russian family changed also the name.. ROMANOV ) claimed the title of "Caesar"of the Roman Empire.
The Ottoman Islamic SULTANS claimed the title of "Caesar"of Roman Empire
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