Smith’s Bible Dictionary

Bithynia

a Roman province of Asia Minor. Mentioned only in (Acts 16:7) and in 1Pet 1:1 The chief town of Bithynia was Nicaea, celebrated for the general Council of the Church held there in A.D. 325 against the Arian heresy.

Smith’s Bible Dictionary, William Smith (1863). Public domain, from the CrossWire SWORD module.