Comments

"States, such as Palmyra, temporarily divided the Empire in a 3rd-century crisis". Perhaps that could be clearer (how did small city-states divide a huge empire?).

" in his classical epic poem the Aeneid. In the Aeneid, ..." Maybe avoid the repetition.
 
"Concrete made possible the paved, durable Roman roads": so they were constructed with concrete? Needs a ref, and I think some explanation. Roman_roads#Construction_and_engineering says nothing about the use of cement or concrete?

In fact the whole Ancient_Rome#Technology section needs more referencing.

I have marked up a few sections, e.g. Punic Wars, Government, Economy, Games and recreation, that need more references.

There is scope for an image in Punic Wars - you could have Hannibal and Scipio side-by-side, perhaps.

"Quaestors were made automatic members of the Senate". Perhaps they were automatically made members.

Adjectives are somewhat astray in some places, e.g. "the famous Hadrian's Wall", the "famously decisive Battle of Zama" - who says it's famous?

Image captions: there are many people here, over a very long time period, so dates might be a help in the captions.

The maps are noticeably in very different (ok, random) styles, which is quite distracting to the reader. It would be desirable (so, not a GA requirement) to harmonise these.

References are formatted very diversely, from naked links to full citations. This is not a GA issue but needs to be tidied up radically for FA.