Bithynia

Bithynia was a Roman province in northwest Asia Minor, situated along the southern shore of the Propontis (Sea of Marmara) and the Black Sea (Pontus Euxinus). It was formed as a Roman province in 74 BC, often administered together with Pontus as a single province under a proconsular governor. The territory included fertile coastal lowlands and was one of the more prosperous regions of Asia Minor.

Bithynia appears twice in the New Testament in significant missional contexts. In Acts 16:7, Paul and his companions attempted to enter Bithynia on the second missionary journey but were prevented by the Spirit of Jesus—one of the most striking narrative instances of the Spirit redirecting missionary plans. This redirection led instead to the Macedonian vision and the opening of the gospel in Europe. In 1 Peter 1:1, Peter addresses his letter to the elect exiles of the dispersion in Pontus, Galatia, Cappadocia, Asia, and Bithynia—indicating that Christian communities had been established there, whether by subsequent missionary work or through the movement of believers from other regions. Pliny the Younger's famous letter to Trajan around AD 112, written as governor of Bithynia, provides valuable external testimony to the rapid growth of Christianity in the province.