And the high priest Ananias commanded them that stood by him to smite him on the mouth.
Note 2 at Ac 23:2: This is the first of three times Ananias is mentioned in Scripture (2nd, Ac 24:1; and 3rd, Ac 25:2). From these references we can see that Ananias was the leader of the Jews' opposition against the Apostle Paul. He even agreed to request another audience with Paul so that certain Jews could ambush and kill him along the way.
Josephus wrote that Ananias was appointed high priest by Herod in A.D. 48 (The Antiquities of the Jews, Book 20, Chapter 5, Section 2). Ananias commanded Paul to be struck for saying he had lived in all good conscience before God. This caused Paul to respond with a prophecy that God would strike Ananias. This came to pass a few years later in A.D. 67 when Ananias was murdered as a result of a tumult caused by his own son (The Wars of the Jews, Book 2, Chapter 17, Sections 2 and 9).