There is no known author named "Portia Martial". It's likely you're thinking of
Martial, the Roman poet who lived from approximately 40 to 104 AD. He is best known for his
Epigrams, a collection of witty and satirical poems.
There are no known female authors named "Portia" who wrote during the Roman period.
Perhaps you are thinking of a different author or have misremembered the name. Could you please clarify?