I, Messalina by Janet Baker

This short story is a vile little postscript to the life of Messalina, Empress of Rome. The story ventures into bestiality and thus the reader is forewarned.

According to Wikkipedia;

Roman sources claim that Messalina used sex to enforce her power and control [over] politicians, that she had a brothel under an assumed name and organised orgies for upper class women, and that she sold her influence to Roman nobles or foreign notables.
Juvenal is also highly critical of her in his Satire VI translation by Peter Green.