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c.1200, see caesarian; Old English had casere, which would have yielded modern *coser, but it was replaced in Middle English by keiser, from Norse or Low German, and later in Middle English by the French or Latin form of the name. Cæsar was used as a title of emperors down to Hadrian (138 C.E.), and also is the root of German Kaiser and Russian tsar (see czar). He competes as progenitor of words for "king" with Charlemagne (Latin Carolus), as in Lithuanian karalius, Polish krol. In U.S. slang c.1900, a sheriff was Great Seizer.
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).