Popular Turkish tv series Kurulus: Osman is based on lifestory Osman I, also called Osman Gazi, (born c. 1258—died 1324 or 1326), ruler of a Turkmen principality in northwestern Anatolia who is regarded as the founder of the Ottoman Turkish Empire. Both the name of the dynasty and the empire that the dynasty established are derived from the Arabic form (ʿUthmān).
Osman was descended from the Kayı branch of the Oğuz Turkmen. His father, Ertugrul, had established a principality centred at Sögüt. With Sögüt as their base, Osman and the Muslim frontier warriors (Ghazis) under his command waged a slow and stubborn conflict against the Byzantines, who sought to defend their territories in the hinterland of the Asiatic shore opposite Constantinople (now Istanbul). Osman gradually extended his control over several former Byzantine fortresses, including Yenişehir, which provided the Ottomans with a strong base to lay siege to Bursa and Nicaea (now İznik), in northwestern Anatolia. Osman was succeded by his son Orhan, who captured Bursa on April 6, 1326. Ottoman tradition holds that Osman died just after the capture of Bursa, but some scholars have argued that his death should be placed in 1324, the year of Orhan’s accession.