The meaning of Illyricum in the Bible
(From Easton's Bible Dictionary)

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 (II 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.

See more on the meaning of Illyricum in the Bible:
Illyricum {International Standard Bible Encyclopedia}
Illyricum {Hitchcock's Bible Name}

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