The common title given to succeeding Roman emperors, adopted from the name of Julius Caesar. Matthew 22:17,21; Mark 12:14,16,17; Luke 2:1; John 19:12,15; Acts 25:8,21; Philippians 4:22; etc. The history of the New Testament fell under the reigns of Augustus, Tiberius, Caligula, Claudius, and Nero.