The Greek noun Asiarches (Ἀσιάρχης) refers to an "Asiarch" — a prestigious title held by leading men of the Roman province of Asia who presided over the imperial cult festivals and games. Asiarchs were elected officials, typically wealthy, who funded public religious events in honor of Rome and the Emperor.
In Acts 19:31, during the riot at Ephesus, "some of the Asiarchs (Asiarchen), who were his friends, sent him a message begging him not to venture into the theater." This passing detail is remarkable: Paul had cultivated friendships with some of the most powerful men in Ephesus — officials of the imperial cult — who nonetheless respected and protected him. It demonstrates that the gospel penetrates every level of society and that God can use even pagan officials to protect His servants. Paul's work at Ephesus had been so impactful that even city leaders sought his safety.