(sovereign ), the name of a man in whose school or place of audience Paul taught the gospel for two years, during his sojourn at Ephesus. See (Acts 19:9) (A.D. 52,53.) The presumption is that Tyrannus himself was a Greek, and a public teacher of philosophy or rhetoric.
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Smith, William, Dr. "Entry for 'Tyran’nus'". "Smith's Bible Dictionary".