Smith's Bible Dictionary
Illyr'icum. 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.
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Smith, William, Dr. Entry for 'Illyricum'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/i/illyricum.html. 1901.