Suetonius is biography rather than fiction, of course.
Allan Massie has written some interesting stuff -- Augustus, Tiberius (which might be good in conjunction with Yourcenaur), and Caesar (which has the benefit of being narrated by Decimus Brutus -- the other Brutus).
Colleen McCullough has a whole series, of which the first couple are by far the best -- The First Man in Rome and The Grass Crown, which are about Marius and Sulla at the very start of the first century BCE.
Then there's Lindsey Davis, The Course of Honour, about Antonia Caenis, an Imperial freedwoman (former slave) who becomes Vespasian's mistress.
I recall that Steven Saylor's first few mysteries aren't too bad -- especially Roman Blood.
Re: Roman
Allan Massie has written some interesting stuff -- Augustus, Tiberius (which might be good in conjunction with Yourcenaur), and Caesar (which has the benefit of being narrated by Decimus Brutus -- the other Brutus).
Colleen McCullough has a whole series, of which the first couple are by far the best -- The First Man in Rome and The Grass Crown, which are about Marius and Sulla at the very start of the first century BCE.
Then there's Lindsey Davis, The Course of Honour, about Antonia Caenis, an Imperial freedwoman (former slave) who becomes Vespasian's mistress.
I recall that Steven Saylor's first few mysteries aren't too bad -- especially Roman Blood.