Bayezid I was the Ottoman Sultan from 1389 to 1402. He was the son of Murad I and Gülçiçek Hatun. He built one of the largest armies in the known world at the time and unsuccessfully besieged Constantinople. He adopted the title of Sultan-i Rûm, Rûm being an old Islamic name for the Roman Empire.
1st Sultan Usman Ghazi History :-
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2nd Sultan Orhan Ghazi History:-
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3rd Sultan Murad I History:-
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Books Reference Link:-
https://play.google.com/store/apps/details?id=com.octagram.saltanat.e.usmania
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