Orhan Bey was born in 1281. His father is Osman Bey, his mother is Malhun Hatun. Orhan Bey had a yellow beard, long tall blue eyes. He was a soft-tempered, compassionate, loving public, respectful, pious, never frightened man, peoples loved him . He often visiting them very much. Orhan Bey passed on head of the state, father Osman Gazi, died in 1326.
Orhan Ghazi in 1346, he married the Byzantine Emperor VI.Yoannis Kantakuzinos's the daughter Teodora and governor of Yarhisar's the daughter Holofira. While the Holofira was going to be married with governor of Bilecik, the wedding was taken and taken prisoner. After he became a Muslim, his name was changed to Nilufer Hatun. From this marriage, Murad Hudavendigar, who will be the third ruler of the Ottoman State, was born. The most important political and military success of Orhan Ghazi, who was always at the head of the army in the wars, was undoubtedly the taking of Bursa on April 6, 1326. Orhan Bey made Alauddin Ali Bey vizier. Seized Orhaneli and came to the front of Bursa and surrounded the city. The city was taken without a serious conflict. The state's center was transferred from Bilecik to Bursa.