A country of Europe, lying east of the Adriatic sea, north of Epirus, and west of Macedonian. It was anciently divided into Liburnia, now Croatia, on the north, and Dalmatia on the south, which still retains its name. See DALMATIA. The limits of Illyricaum varied much at different times. It was reached by Paul, preaching the gospel of Christ, and probably traversed in part, A. D. 57, Romans 15:19.

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 Timothy 4:10). It was traversed by Paul in his third missionary journey (Romans 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.

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)