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Paphlagonia (păf´ləgō´nēə), ancient country of N Asia Minor, between Bithynia and Pontus on the Black Sea coast, in modern Turkey. A mountainous district with the Halys as its chief river, Paphlagonia had a string of Greek colonies (including Sinope) along its coast. It was not a political unit and was annexed and occupied by the kings of Bithynia and Pontus respectively. It was won (63 BC) by the Romans.