He was nicknamed as Black or particularly Kara in Turkish, which according to an ancient Turkman tradition glorifies brave and heroic person. Kulurus Osman Ghazi was a tall man with a broad and high chest and long arms, dark tan, round face with a thin beard and long thick mustache, ram nose, hazel eyes, thick eyebrows, had deep and fine voice, expert on horse riding, sword using, and battle proven strategies. Kulurus Osman Ghazi became chief or bey , upon his father’s demise in 1280. Nothing is clear or certain about Osman’s early life activities, except that he controlled and govern the region around the town of Sogut and from there he launched attacks against the neighboring Byzantine Empire. The first remarkable event in Kulurus Osman Ghazii’s life is the Battle of Bapheus some where in between 1301 or 1302, in which he comprehensively defeated a Byzantine army sent to counter him. After his appointment to throne, he gathered many Turkic tribes around himself and fought against Byzantines, joining hands with Alaeddin Keykubad I of the Seljuks. When the Seljuk Empire remained with no ruler to rule due to the exile of Alaaddin, Osman Gazi gathered them under his rule in 1299 and set the foundation steps of the great Ottoman Empire. Osman Gazi continued his ambitious campaigns against the remainings of the Byzantine Empire in the region along with his close supporters and family members. He focused on the strategy to cut the Byzantine’s trade routes and remain quite successful with it forcing local rulers to surrender.