Julia gens in the context of "Museo Pio-Clementino"

Alba Longa (occasionally written Albalonga in Italian sources) was an ancient Latin city in Central Italy in the vicinity of Lake Albano in the Alban Hills. The ancient Romans believed it to be the founder and head of the Latin League, before it was destroyed by the Roman Kingdom around the middle of the 7th century BC and its inhabitants were forced to settle in Rome. In legend, Romulus and Remus, founders of Rome, had come from the royal dynasty of Alba Longa, which in Virgil's Aeneid had been the bloodline of Aeneas, a son of Venus.

According to Livy, Roman patrician families such as the Julii, Servilii, Quinctii, Geganii, Curiatii and Cloelii originated in Alba Longa.

Livia Drusilla (30 January 59 BC – AD 29) was Roman empress from 27 BC to AD 14 as the wife of Augustus, the first Roman emperor. She was known as Julia Augusta after her formal adoption into the Julia gens in AD 14.

Livia was the daughter of senator Marcus Livius Drusus Claudianus and his wife Alfidia. She married Tiberius Claudius Nero around 43 BC, and they had two sons, Tiberius and Drusus. In 38 BC, she divorced Tiberius Claudius Nero and married the political leader Octavian. The Senate granted Octavian the title Augustus in 27 BC, effectively making him emperor. In her role as Roman empress, Livia served as an influential confidant to her husband and was rumoured to have been responsible for the deaths of several of his relatives, including his grandson Agrippa Postumus.

Gaius Julius Iullus (fl. c. 489 BC) was a Roman politician from the early Republic. He was the first from the ancient patrician clan of the Julii to attain the consulship, which he held in 489 BC as the colleague of Publius Pinarius Mamercinus Rufus.

According to Dionysius, it was during their year of office that the Volscian leader Attius Tullius provoked a confrontation with Rome. With the help of the Roman exile Coriolanus, the Volsci prepared for war and began raiding Latin territory. As planned, the impact of the Volscian operations fell more heavily on the poor, exacerbating the already tense relationship between the patricians and the plebeians. As the Senate was trying to calm the populace, a Volscian force under Coriolanus took control of the city of Circeii, where there was a Roman colony. The consuls were directed to set a watch over the city, call upon Rome's allies for help, and begin raising an army to meet the Volscian threat, but their term of office expired before these tasks could be completed. It fell to their successors to continue preparing for the inevitable confrontation with Coriolanus.

Livia Drusilla (30 January 59 BC – AD 29) was Roman empress from 27 BC to AD 14 as the wife of Augustus, the first Roman emperor. She was known as Julia Augusta after her formal adoption into the Julia gens in AD 14.

Livia was the daughter of senator Marcus Livius Drusus Claudianus and his wife Alfidia. She married Tiberius Claudius Nero around 43 BC, and they had two sons, Tiberius and Drusus. In 38 BC, she divorced Tiberius Claudius Nero and married the political leader Octavian. The Senate granted Octavian the title Augustus in 27 BC, effectively making him emperor. In her role as Roman empress, Livia served as an influential confidant to her husband and was rumored to have been responsible for the deaths of several of his relatives, including his grandson Agrippa Postumus.

Drusus Julius Caesar (7 October c. 14 BC – 14 September AD 23), also called Drusus the Younger, was the son of Emperor Tiberius, and heir to the Roman Empire following the death of his adoptive brother Germanicus in AD 19.

He was born at Rome to a prominent branch of the gens Claudia, the son of Tiberius and his first wife, Vipsania Agrippina. His name at birth was Nero Claudius Drusus after his paternal uncle Nero Claudius Drusus (Drusus the Elder). In AD 4, he assumed the name Julius Caesar following his father's adoption into the Julii by Augustus, and became Drusus Julius Caesar.

The Julii Caesares were the most illustrious family of the patrician gens Julia. The family first appears in history during the Second Punic War, when Sextus Julius Caesar was praetor in Sicily. His son, Sextus Julius Caesar, obtained the consulship in 157 BC; but the most famous descendant of this stirps is Gaius Julius Caesar, a general who conquered Gaul and became the undisputed master of Rome following the Civil War. Having been granted dictatorial power by the Roman Senate and instituting a number of political and social reforms, he was assassinated in 44 BC. After overcoming several rivals, Caesar's adopted son and heir, Gaius Julius Caesar Octavianus, was proclaimed Augustus by the senate, inaugurating what became the Julio-Claudian line of Roman emperors.

The Amidei family was an ancient Italian noble family from Florence, Italy. The family was of Roman descent but lived in Florence since its foundation. They have been described by Niccolò Machiavelli as being one of the most powerful families of its time, and were featured in Dante's poems on the political struggles of the Guelphs and Ghibellines in medieval Italy. Ancestors of the House of Piccolomini, Patricians of Siena, they married into the Medici family during the 20th century. The Amidei also claimed a Julia gens (Gens Iulia) ancestry, through the Cottius family, Patricians of Rome.