To which governor in Caesarea did the Roman commander send Paul under heavy guard?

Answer: Felix

Learning of the plot, the commander sent Paul by night with soldiers, horsemen and spearmen to Governor Felix in Caesarea.

“Then he called two of his centurions and said, “Prepare two hundred soldiers, seventy horsemen, and two hundred spearmen to go to Caesarea in the third hour of the night. Provide mounts for Paul to take him safely to Governor Felix.””— Acts 23:23-24 (BSB)