In Byzantine period, it was a fortress called Belekome. It has a very special place in the history of the Turks because it was an important center in the foundation period of the Ottoman Empire.
Upon the capture of the city by Orhan Gazi, a clan chief, the foundations of the empire, which was to reign for 600 years, were laid.
The city today is divided into two parts. The Old quarter, which is in a deep valley, has the tombs (turbe) of Bala Hatun and Seyh Edibali, the mosque and zaviye (a small convent) of Orhan Ghazi, the remains of a few minarets, a bath and a historical graveyard worth a visit.