Gordoservon
Gordoservon or Gordoserbon or Gordoserba (; ) 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. Most notably, the city is mentioned in the acts of the Council of Trullo (691-692), as a seat of bishop Isidore, who attended the council. The exact location of this city, and etymology of its name, have been a subject of interest for scholars, who proposed several solutions for both questions. History In the 7th century, the Byzantine Emperors Constans II (in 657–658) and Justinian II (in 688–689) led expeditions against the Balkan Slavs as far as rivers Struma and Vardar in the region of Macedonia. Many of the conquered tribes were transferred to the Opsikion district of northwestern Asia Minor. Part of those Asia Minor Slavs deserted to the Arabs in 665 and again in 692. As the name of the city could suggest that among its founders were Serbs, some modern scholars consider that the colony was founded by these Slavs, and variously date it to 649, 667, 680, or 688–689. According