According to Tertullian, one of the church fathers, John was plunged in burning oil in front of a massive crowd that had filled the Roman Coliseum in order to silence his ministry. But God was not yet finished with his aged apostle. Tertullian reported that John came out of the burning caldron alive and unharmed! This miracle resulted in the mass conversion to Christ of nearly all who witnessed it. John was later banished to the island of Patmos where he wrote the book of the Revelation of Jesus Christ.
