Illyricum
   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.
   

Illyricum, joy; rejoicing