We know very little about Osman, the founder of the Ottoman Empire. But perhaps by examining the legends surrounding him we can discern the shape of the truth.
Osman's conquests:
https://en.wikipedia.org/wiki/Osman_I#/media/File:Osman_I_area_map.PNG
Bithynia:
https://en.wikipedia.org/wiki/Bithynia_and_Pontus#/media/File:Roman_Empire_-_Bythinia_et_Pontus_(125_AD).svg
Sultanate of Rum:
https://commons.wikimedia.org/wiki/File:Seljuk_Sultanate_of_Rum_1190_Locator_Map-pt.svg
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