Concise Bible Dictionary:

The god Hermes of the Greeks, identified with Mercurius of the Romans. When a miracle had been wrought by Paul at Lystra the heathen inhabitants supposed this god was visiting them in the person of Paul, and the priest would have sacrificed to him (Acts 14:1212And they called Barnabas, Jupiter; and Paul, Mercurius, because he was the chief speaker. (Acts 14:12)).

Jackson’s Dictionary of Scripture Proper Names:

eloquent: learned: shrewd: crafty