Numa Pompilius
The praenomen Mamercus is best known from "gens Aemilia", one of the greatest of the patrician houses at Rome, which claimed descent from Mamercus, said to have been a son of Numa Pompilius, the second king of Rome. Several prominent members of this family bore the name during the Roman Republic. The Pinarii, another patrician family, is also said to have used the praenomen Mamercus, although no examples from this "gens" have been preserved. According to one tradition, the Pinarii were descended from another son of Numa Pompilius, although in his history of Rome, Titus Livius records that the "gens" was still more ancient, and predated the founding of the city.