). A tetrarch of Galatia, who adhered to the
Romans in their wars against Mithridates, and was rewarded by the Senate with the title of
king. In the Civil War he sided with Pompey, and was present at the battle of Pharsalia, B.C.
48. He is remembered as having been defended by Cicero before Caesar (B.C. 45), in the house
of the latter at Rome, in the speech (Pro Rege Deiotaro
) still extant. The
charge against Deiotarus was of attempting to murder Caesar.