Hail Caesar is written by the hugely talented Rick Priestley who is something of an expert in Ancients gaming. Partly because of his studying in antiquities but some would say that it's also because he was there for the most part.
So aside from firsthand experience of classical civilisations what else do you get?
A 192 page, full colour, A5 softback rulebook
By the award winning team that produced Black Powder
Covers gaming in periods from biblical times to the Crusades