BITHYNIA (bĭ-thĭn'ĭ-a, Gr. Bithynia). A region along the northern edge of Asia Minor fronting on the Black Sea, the Bosphorus, and the Sea of Marmara. Paul and his companions desired to enter Bithynia with the gospel (Acts.16.6-Acts.16.10), but the [[Holy Spirit]] was leading toward Europe, and so they could not enter. However, there were Christians there in the first century (1Pet.1.1). The Roman governor [[Pliny the Younger]] complained to Trajan concerning the Christians and at the beginning of the second century asked how to deal with them.