Dio Cassius (Cassius Dio), ca. AD 150-235, was born in Bithynia. Dio's work is a vital source for the last years of the Roman republic and the first four Roman emperors.
Of the eighty books of Dio's great work, Books 36-60 have come down to us (with some gaps). Roman history from the assassination of Julius Caesar in 44 < FONT SIZE="-1">