Bible Dictionaries
Tyrannus

Watson's Biblical & Theological Dictionary

It is said in Acts 19:9 , that St. Paul being at Ephesus, and seeing that the Jews to whom he preached, instead of being converted, were rather more hardened and obstinate, he withdrew from their society, nor went to preach in their synagogue, but taught every day in the school of one Tyrannus. It is inquired, Who was this Tyrannus? Some think him to have been a prince or great lord, who accommodated the Apostle with his house, in which to receive and instruct his disciples. But the generality conclude, that Tyrannus was a converted Gentile, a friend of St. Paul, to whom he withdrew.

Bibliography Information
Watson, Richard. Entry for 'Tyrannus'. Richard Watson's Biblical & Theological Dictionary. https://www.studylight.org/​dictionaries/​eng/​wtd/​t/tyrannus.html. 1831-2.