Gordoservon
Gordoservon or Gordoserbon or Gordoserba (Greek: Γορδόσερβον; Serbian: Гордосервон, Гордосербон) was an early medieval Byzantine city, and a bishopric, suffragan of the Metropolis of Nicaea, in the region of Bithynia, Asia Minor. It is mentioned in several ecclesiastical sources from the period between the 7th and the 9th century.