Coordinates: 39°23′06″N 27°31′59″E / 39.385°N 27.533°E / 39.385; 27.533
Balıkesir (Turkish pronunciation: [baˈlɯkesiɾ]) is the capital city of Balıkesir Province. Balıkesir is in the Marmara region of Turkey and has a population of 331,788 inhabitants. Between 1341-1922, it was the capital of Karesi.
Close to modern Balıkesir was the Roman town of Hadrianutherae, founded, as its name commemorates, by the emperor Hadrian. Hadrian came to the region in A.D. 124, as a result of a successful bear hunting he had established a city called his own name here. It is estimated that the city consisted of the castle, the homestead, the stud and a few homes. It is thought that the small town was the stadium where to be present. Members of the Roman and Pre-Byzantine dynasty had used this castle as a vacation area and for hunting. During Byzantine period, the small town which had become increasingly neglected was known as Palaeokastron (Greek: Old Castle). Also, when the Turkmens came from Middle Asia to Mysia, they called it Balak Hisar because of the remains of castle, as Hisar is the Turkish word for castle.