The Numistrii were one of Pompeii's oldest and most powerful families. All that is certain is that Eumachia was able to use her wealth and social standing to obtain the position of public priestess of the goddess Venus Pompeiana (the city's patron goddess), and she became a successful patronus of the economically significant guild of fullers, the guild which consisted of tanners, dyers and clothing-makers.
The Numistrii family was one of the most prominent in Pompeii. Eumachia's wealth and social standing allowed her to secure the priestess position for Venus Pompeiana, and she became a key supporter of the fullers' guild, which consisted of tanners, dyers, and clothing manufacturers.