Albert Barnes on Acts 24:1

And after five days. This time was occupied, doubtless, in their receiving the command to go to Caesarea, and in making the necessary arrangements. This was the twelfth day after his arrival at Jerusalem. See Acts 24:11.

Ananias the High Priest. Acts 23:2.

Descended. Came down from Jerusalem. This was the usual language when a departure from Jerusalem was spoken of. Acts 15:1.

With a certain orator named Tertullus. Appointed to accuse Paul. This is a Roman name, and this man was doubtless a Roman. As the Jews were, to a great extent, ignorant of the Roman customs and laws, and of their mode of administering justice, it is not improbable that they were in the habit of employing Roman lawyers to plead their causes.

Who informed the governor against Paul. Who acted as the accuser, or who managed their cause before the governor.

(i) "Ananias" Acts 23:2, 25:2 (k) "who informed" Ps 11:2