
The gens Herennia was a plebeian family at Rome. Members of this gens are first mentioned among the Italian nobility during the Samnite Wars, and they appear in the Roman consular list beginning in 93 BC. In Imperial times they held a number of provincial offices and military commands. The empress Herennia Etruscilla was a descendant of this gens.
The gens Hirtia was a plebeian family at ancient Rome. The most distinguished member of the gens under the Republic was Aulus Hirtius, consul in 43 BC.
The gens Juventia, occasionally written Jubentia, was an ancient plebeian family at Rome. After centuries of obscurity, the gens emerges into history with the appearance of Titus Juventius, a military tribune, in the beginning of the second century BC. The first of the Juventii to obtain the consulship was Marcus Juventius Thalna in BC 163. But the family is renowned less for its statesmen than for its jurists, who flourished during the second century AD.

The gens Lollia was a plebeian family at Rome. Members of the gens do not appear at Rome until the last century of the Republic. The first of the family to obtain the consulship was Marcus Lollius, in 21 BC.

The gens Lutatia, occasionally written Luctatia, was a plebeian family of ancient Rome. The first of the gens to obtain the consulship was Gaius Lutatius Catulus in 242 BC, the final year of the First Punic War. Orosius mentions their burial place, the sepulchrum Lutatiorum, which lay beyond the Tiber.

The gens Maecilia was a minor plebeian family at ancient Rome. Although of great antiquity, only two members of this gens are mentioned in republican times, both tribunes of the plebs in the first century of the Republic. The Maecilii appear again, somewhat sporadically, in imperial times, even obtaining the consulship during the early fourth century. One of the last emperors of the Western Empire was Marcus Maecilius Avitus.

The gens Mamilia was a plebeian family at Rome during the period of the Republic. The gens was originally one of the most distinguished families of Tusculum, and indeed in the whole of Latium. It is first mentioned in the time of the Tarquins; and it was to a member of this family, Octavius Mamilius, that Lucius Tarquinius Superbus, the seventh and last King of Rome, betrothed his daughter. The gens obtained Roman citizenship in the 5th century BC, and some of its members must subsequently have settled at Rome, where Lucius Mamilius Vitulus became the first of the family to hold the consulship in 265 BC, the year before the First Punic War.
The gens Salvia was a minor Roman family toward the end of the Republic. The first of the family known to have held public office at Rome was Publius Salvius Aper, praetorian prefect in 2 BC. About this time, the Salvii achieved equestrian rank, and thereafter held various positions in the Roman state for the next two centuries, before falling back into obscurity. The most illustrious of the Salvii was probably Marcus Salvius Otho, proclaimed emperor in AD 69.