She is known from the work of a single roman historian, Tacitus.
British Dictionary definitions for Tacitus
Publius Cornelius (ˈpʌblɪəs kɔːˈniːljəs). ?55–?120 ad, Roman historian and orator, famous as a prose stylist. His works include the Histories, dealing with the period 68–96, and the Annals, dealing with the period 14–68