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Osman ghazi was born in 1258 in sogut. He was the son of ertugrul Gazi.Osman was very barve since his childhood . He was called as 'kara' by his family members.
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After the death of his father in 1280. At the age of 23 Osman gazi took command of the tribe .
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Osman did 2 marriages one with Maal hatun and second was Rabia bala hatun.
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Osman conquered kolachaisar castle along with his companion.
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osman force capture the city of yanisehir and make it the first capital of Osman's beylik.
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Osman consolidate his hold to the countryside.
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Osman ghazi completely isolated Bithynian capital of Pursa and lay siege to it. The defenders held out valiantly thanks to a steady stream of supplies through their maritime connection with Constantinople.
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Osman however would not see the siege to completion his son orhan would bw the one who captured the city .
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Osman ghazi died just after capture bursa. But some scholars have argued that his death should be placed in 1324, the year of orhan's accession.