And Unsworth is correct in his final point, that one must remember that these works are fiction, however well-researched. One must be careful not to take Graves' version, or the television adaptation, which as Mary Beard has reminded us, is as much Jack Pulman's work as Graves' - it's clear that Pulman went back to the original sources - as what actually happened.
At a study weekend I taught recently, after my well-received lecture on Rome in films, I was asked which Roman character I'd put on film if I had the chance. I avoided the question, but now I have to say, hubristic though it would be, I'd like to do Claudius again. My Claudius would be a skillful politician, one who marries his niece and adopts her son not because he has been enticed by her sexual wiles (Tacitus' version) or to discredit the empire (Graves and Pulman), but to avert civil war and ensure a smooth succession (you can see why I think this here). I might even be mischievous, and pick up the suggestion that some have made that Claudius was the one pulling the the strings behind the assassination of Caligula, or my own speculation that, on his deathbed, he commissioned Seneca to rubbish him in the Apocolocyntosis, to boost Nero's reputation (and yes, I know that one's wacky). But however much I believed it was plausible, it would still, like Graves, be fiction.