Livia gens
The gens Livia was an illustrious plebeian family at ancient Rome. The first of the Livii to obtain the consulship was Marcus Livius Denter in 302 BC, and from his time the Livii supplied the Republic with eight consuls, two censors, a dictator, and a master of the horse. Members of the gens were honoured with three triumphs. In the reign of Augustus, Livia Drusilla was Roman empress, and her son was the emperor Tiberius. Origin. History preserves no traditions concerning the origin of the Livian gens. Although its members are not found in the first two centuries  of the Republic, there is nothing in particular to suggest a foreign origin. The regular cognomina of the Livii are all Latin. The nomen "Livius" is generally supposed to be derived from the same root as , and , all with the meaning of leaden or bluish-grey, but this connection is not absolutely certain. Pokorny dismissed this derivation, arguing that the nomen either predated these words, or could not be linguistically connected with them. He hypothesized an Etruscan origin for the Livii. Branches and cognomina. The cognomina of the Livii during the Republic were "Denter, Drusus, Libo, Macatus", and "Salinator". Of  these, "Denter" was a common surname originally referring to someone with prominent teeth. "Macatus" means "spotted", being derived from the same root as "macula". "Drusus" probably means "stiff", although Suetonius records a tradition that the first of the name received it after slaying a Gallic chieftain named "Drausus". If this is the true origin of the name, then it probably dates the story to the year 283 BC, when the Senones, the Gallic people of whom Drausus was said to be the leader, were defeated and scattered, for the most part vacating northern Italy. "Libo", derived from "libere", designated a  libation pourer, and entered the family from the Scribonia gens, one of whom was adopted by the Livii Drusi. The surname "Salinator", meaning a salt-merchant, is said to have been given in derision to Marcus Livius, who as censor in 204 BC, imposed an unpopular salt tax. A question arises from the fact that Marcus' father is also referred to as "Salinator", although the historians may simply have applied the cognomen retroactively.