Reddit mentions of Memoirs of Hadrian (FSG Classics)

Hope I'm not too late to the party. In this thread you'll find a lot of material on Rome, but I wouldn't go as far as calling them sources. HBO's Rome is a historical fiction TV series, and Dan Carlin's Hardcore History, of which I'm a fan, should never substitute genuine academic work or ancient literature. If you're looking for books, there's a plethora of works to choose from.

In the lighter end of literature, you'd do well reading Mary Beard, Adrian Goldsworthy or Tom Holland - all educated in Classicism from either Oxford or Cambridge. I'd categorise most of their work as popular history, so they're easy reads, yet made with authority on the subject.

If you want your information straight from the horse's mouth, you can also look into works written by the Romans themselves, such as Livy, Plutarch or Suetonius. Reading these can be a little challenging/dull at times though, as they don't conform to our modern ways of structuring a narrative.

As for fiction, which, if done right, does have something to offer, you'd benefit from checking out I, Claudius, Memoirs of Hadrian or Julian imo.

This might or might not be up your alley, but Memoirs of Hadrian is a really interesting fictionalized memoir of the emperor's thoughts. Some really great lines in that book.