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He was born in 1258 in Sogut, Anatolia.
He got the title bey (chief) from his father, Ertoğrül, as ruler of the Söğüt tribe in 1299. -
Ruled the Sögüt, Ottoman Empire (now in Turkey)
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He married Valide Sultan Malhun Hatun, daughter of Abdulaziz Bey.
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Ertuðrul Gazi, Chief of the Kayi dies. Osman takes over as ruler.
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Orhan I, son of Osman is born.
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Osman announced the independence of his own kingdom from the Seljuk Turks in 1299
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Osman killed his uncle Dundar with an arrow
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Osman had established his residence in Konya, before the capital was moved to Bursa and later to Constantinople.
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Osmans army defeated the Byzantine in Nicaea.
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Just before his death in 1326, his son and successor, Orkhan, took the city of Bursa from the Byzantines.
Later died in 1326.