Osman Ghazi, conquered the castle where the first, is Fathoms Hisar near Inegol. Very pleased upon which the conquest of this place, the Anatolian Seljuk Sultan Masud II.Giyaseddin, to Osman Ghazi of gave the title Bey. Osman Ghazi the rise, disturbed governor of Bilecik, and anticipate danger, tried to assassinate him by inviting Osman Ghazi, to his son's wedding where he would marry his daughter of the governor of Yarhisar. But Osman Ghazi's friend, governor of Bilecik and hostile to each other, governor of Harmankayasi informed Osman Bey of this trap. Osman Bey, who came to Bilecik with his soldiers in advance and conquered Bilecik among the lands adding, he say for conquest is the game in game. Governor of Bilecik was killed at the end of the war and the bride who was the daughter of governor of Yarhisar with was married Osman Ghazi's son Orhan Bey. Osman Bey in 1299, it declared its independence from other Turkish dynasties in Anatolia, Ottoman Principality's has established. After this date, who lived for more than 27 years, Izmit, Adranos, Kestel, Imrali, Akhisar, Lefke, Tekfurpınar of Yenikale, Yanıkcahisar is, Mudanya, Karamursel, adding to the region, such as Bursa soil, pave the Ottoman Empire's growth, Osman Bey death it in 1326. Taking Inegol in 1299 is accepted as the foundation of the Ottoman Empire. In the year 1302 the Battle of Koyunhisar, with the army of Byzantine Empire was the first time. The Ottomans won this war. After the battles that took place, he surrounded Bursa in 1315 and was sickened during the war. In the year 1324, to his son Orhan he left state affairs. However, the sultanate has actually continued. Again, the first Ottoman coin money was printed in this period. In 1326 because of podagra illness, died. Osman Ghazi, who takes over from his father Ertugrul Ghazi approximately 4,800 km², his son to Orhan Ghazi the Ottoman lands were handed over 16,000 km².
