Tyrannus

Easton's Bible Dictionary (1897)

Prince, a Greek rhetorician, in whose “school” at Ephesus Paul disputed daily for the space of two years with those who came to him (Acts 19:9). Some have supposed that he was a Jew, and that his “school” was a private synagogue.

Smith's Bible Dictionary (1863)

(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.

Hitchcock's Bible Names Dictionary (1869)

a prince; one that reigns

Public domain dictionaries.