Final answer:
Paul, a Roman citizen and Christian apostle, exercised his right to appeal to Caesar for trial in Rome, which is documented in the New Testament's Book of Acts, unrelated to Julius Caesar's era.
Step-by-step explanation:
By appealing to Caesar, Paul, also known as Saul before his conversion to Christianity, was able to be sent to Rome. This act is described within the context of the early Christian Church in the Book of Acts in the New Testament, and it does not relate directly to Julius Caesar's time.
The notion of Paul getting a "free trip" to Rome refers to his right as a Roman citizen to appeal to Caesar for a trial in Rome concerning the accusations against him, as documented in Acts 25:11-12. This trial was Paul's right to seek justice at the highest level, despite the absence of Julius Caesar, who had been assassinated over a century earlier.