Robert Graves' novels about Claudius draw heavily from Suetonius' Life of Claudius, I think.
All the surviving historians of the time appear to have lied and invented stuff with a freedom and enthusiasm modern propagandists can only envy.
The notion that historians are supposed to limit themselves to what actually happened is a fairly modern one.
The “histories” of the time were probably influenced by the Roman law courts, which were a free-for-all where both sides lied and invented evidence with the greatest freedom. There was nothing even vaguely resembling modern rules of evidence. Victory went not to the side that proved its case logically, based on the evidence, but to the one that most effectively blackened the opposition’s character.
These “historians,” however, especially Suetonius, are highly entertaining.