Overview
Julia Livia (7 – 43 AD), was the daughter of Drusus Julius Caesar and Livilla, and granddaughter of the Roman Emperor Tiberius. She was also a first cousin of the emperor Caligula, and niece of the emperor Claudius.
Biography
Early life
Julia was born in the later years of the reign of her adoptive great-grandfather, Emperor Augustus, and was the daughter of Drusus Julius Caesar (a grandson of Augustus wife' Livia Drusilla through her son Tiberius) and Livilla (a granddaughter of Livia Drusilla through her son Nero Claudius Drusus, and a granddaughter of Mark Antony through his daughter Antonia Minor). At the time of Augustus' death in AD 14, Julia, who was in early childhood, fell ill. Before he died, the aged emperor had asked his wife Livia whether Julia had recovered.
Marriages
Upon the death of Augustus, Julia's paternal grandfather, Tiberius, succeeded him as Rome's second Emperor. It was during her grandfather's rule, when she was around the age of 16, that Julia married her cousin Nero Caesar (the son of Germanicus and Agrippina the Elder). The marriage appears to have been an unhappy one, and fell victim to the machinations of the notorious palace guardsman Sejanus, who exploited his intimacy with Julia's mother Livilla to scheme against Germanicus’ family. In the words of Tacitus,
Whether the young prince spoke or held his tongue, silence and speech were alike criminal. Every night had its anxieties, for his sleepless hours, his dreams and sighs were all made known by his wife to her mother Livia [i.e. Livilla] and by Livia to Sejanus.
From Wikipedia (CC BY-SA 4.0).