Gordoservon

The city Gordo Servon (Serbian Srbograd, Гордосервон, Greek Gορδοσερβα ) in Bithynia was a Byzantine city inhabited by Serbs. The name is derived from the Serbs, who were about 649 (or 667) resettled by the Byzantine emperor Constans II to Asia Minor. The city was located in the former heart of the Phrygian kingdom. Today's Turkish city of Bolu, was previously named Bithynion, which could indicate the geographical location of Gordo Servon.

Isidore, Bishop of Gordo Servon is mentioned 680/681. The fact that this village was the seat of a bishop, suggests that it housed a large Serbian population.

A Byzantine army of 30,000 Slavs (mostly Serbs from Gordo Servon ) was defeated by the Umayyads in 692 at the Battle of Sebastopolis because of widespread Serbian desertion. To escape, they were persuaded by Muhammad ibn Marwan, who reminded them of their forced displacement and related mistreatment by the emperor. Around the year 1200, the city ' Servochoria ' ( Serbian village) is called.