An interest in history carries a risk of becoming interested in historians, which is how I ended up reading this. It covers historians from the Roman East from the end of the 3rd century to the beginning of the 7th, with the greatest attention paid to Eusebius, Ammianus, and Procopius, but lesser lights, often perserved only fragmentarily, are also treated. Treadgold summarizes what's known about the historians' lives and describes their works.

I found the minor historians hard to keep straight - it doesn't help that of forty historians treated, five were called John - and the book is perhaps less suited for reading cover to cover as I did than for dipping into to learn about a particular historian that catches your interest.

Treadgold is freshingly willing to pass value judgements, both on the historical reliability and literary quality of the works, and on the moral qualities of the historians. His conclusion that historical and literary merit tended to go together is perhaps slightly suspect, but encouraging for someone who might one day get around to reading Ammianus or Procopius, but probably never, say, John Malalas.