Illyricum

an extensive district lying along the eastern coast of the Adriatic, from the boundary of Italy on the north of Epirus on the south, and contiguous to Moessia and Macedonia on the east. (Romans 6:19)

A country to the north-west of Macedonia, on the eastern shores of the Adriatic, now almost wholly comprehended in Dalmatia, a name formerly given to the southern part of Illyricum (2 Tim. 4:10). It was traversed by Paul in his third missionary journey (Rom. 15:19). It was the farthest district he had reached in preaching the gospel of Christ. This reference to Illyricum is in harmony with Acts 20:2, inasmuch as the apostle’s journey over the parts of Macedonia would bring him to the borders of Illyricum.