Acts 25: Felix to Festus, change of the Roman governors of Judea

In Acts 25, Felix is substituted by Festus as the new governor of Judea. Although Felix kept Paul in prison for two years (expecting bribery), Festus decided to judge Paul as soon as he came into power. The enemies of Paul asked Festus to judge Paul in Jerusalem when in fact they had a plot to kill him; however Paul refused to go to Jerusalem and appealed to Ceasar, to be judged by the Ceasar Nero.
The king Herod Agrippa I had died in Acts 12, but now his son, Agrippa II received part of Agrippa I territories but not Judea. Festus (who was indeed ruling over Judea) invited Agrippa II to study the case of Paul because it was very difficult to document the accusation against him. Agrippa II realized that Paul was not guilt under the Roman law.
Paul belongs to the kingdom of God. It is very interesting how the kingdom of God grew and gained power in a very humble way; for instance, Paul uses the circumstances to present the kingdom of God when being judged.