Happy Birthday Imperator Diocletianus.

[Diocle]

I've this one and IMO it's pretty good:

'DIOCLETIAN AND THE ROMAN RECOVERY'. Stephen Williams, B T Batsford Ltd-London 1985.

But you could even try

'The New Empire of Diocletian and Constantine'. T.D. Barnes, Harvard University Press, 1982.

But remember that somone (just a poor ****ing f-word), could say I'm always quoting my old texts of the last century.

[Magister Militum Flavius Aetius]

Diocletian and the Roman Recovery is actually still recommended reading. Don't know about the other one though.

[julianus heraclius]

Yes, happy birthday to the great Diocletian without whom the empire may not have survived as long as it did. And yes, Diocletian and the Roman Recovery is very good. There is a great chapter on the religions of the third century and gives a good analysis between the religion of the State and personal salvation religions like Christianity and Mithrasism.