Easton's Bible Dictionary (1897)
The title assumed by the Roman emperors after Julius Caesar. In the New Testament this title is given to various emperors as sovereigns of Judaea without their accompanying distinctive proper names (John 19:15; Acts 17:7). The Jews paid tribute to Caesar (Matt. 22:17), and all Roman citizens had the right of appeal to him (Acts 25:11). The Caesars referred to in the New Testament are Augustus (Luke 2:1), Tiberius (3:1; 20:22), Claudius (Acts 11:28), and Nero (Acts 25:8; Phil. 4:22).
Smith's Bible Dictionary (1863)
always in the New Testament the Roman emperor, the sovereign of Judea.
Hastings' Dictionary of the Bible (1898)
CAE'SAR, the official title of the Roman emperors. It is borrowed from the famous Julius Caesar. It occurs about 30 times in the N. , and is applied to Augustus, Luke 2:1; Tiberius, Luke 3:1; Claudius, Acts 11:28; and Nero, Acts 25:8. Such Jews as were Roman citizens had the right of appeal to Caesar, Acts 25:11, who was their ruler. See separate names.
Schaff's Bible Dictionary
CAESAR, CLAU'DIUS . See Claudius.