Cassius+Dio

Cassius Dio was a Greek historian who also was a Roman senator in the early third century CE. He was a Roman citizen but born and raised in Nicaea, Bithynia. He wrote Roman History which is a compilation of 80 books that cover all of Roman history from the creation of Rome to about the year 229 CE. Fire and Famine is found in the fifty-fifth book. It took Dio twenty-two years to complete the research for these books.

All of this information comes from the Cassius Dio Wikipedia page.