The Routledge history of the ancient world
I picked this up from Amazon used books because of the subject and the author. I have seen David S. Potter as a talking head on some of the historical television shows on Rome. (For example, Rome, Rise and Fall of an Empire I think is one). The period is one I am interested in because it is so poorly documented. It is the period after the Golden Age of the “Five Good Emperors” through the Severan Emperors and then the Crisis of the Third Century. Then comes the Tetrarchy of Diocletian, Constantine and his Sons right down to Theodosius.
The book is a bit dry, which I don’t mind, and has a lot of interesting detail on the era. Not an introductory text by any means. I liked it so much that I hunted up another volume in the series right away. Sadly, that volume was not nearly so good. Since then I have been averse to going for a third one.