Nero Claudius Drusus entered the world between mid-March and mid-April 38 BC, three months after his mother Livia married Augustus on the 17th of January. His legal father was Tiberius Claudius Nero, a man who legally declared himself the boy's parent before divorcing Livia. Rumors circulated that Emperor Augustus was the child's real father, though historical analysis suggests this was impossible since Livia was already pregnant when she met her future husband. Despite these whispers, Emperor Claudius later encouraged the rumor during his reign to create an impression of more direct lineage from Augustus.
Drusus grew up in the house of Tiberius Claudius Nero alongside his brother, the future emperor Tiberius. The two brothers developed a famously close relationship that would last their entire lives. Their bond influenced naming conventions within the family. Tiberius named his eldest son after his dead brother, although eldest sons were usually named after their father or grandfather. Drusus named his second son, the future emperor Claudius, after Tiberius instead.
The young boy originally bore the name Decimus as his praenomen, but his full name changed to Nero Claudius Drusus at some point. Historians debate exactly when or why this shift occurred. Some suggest it happened when his brother Tiberius was adopted by Marcus Gallius, while others argue for the year their father died in 33 BC. A third possibility places the change when he assumed the toga virilis. The names themselves were unusual for the time, placing heavy emphasis on maternal ancestry by using Livia's father's cognomen rather than her husband's.
Alpine And Gallic Administration
In 16 BC, Drusus served as quaestor and fought against Raetian bandits in the Alps. He repelled these forces and gained honors, though he could not smash their armies without reinforcement from Tiberius. The two brothers easily defeated the local Alpine tribes together. This early military experience laid the groundwork for his later administrative reforms across Gaul.
Drusus arrived in Gaul in late 15 BC to serve as legatus Augusti pro praetore of three provinces. His contribution to urban development remains visible today through the pes Drusianus, or 'Drusian foot', a unit of measurement about one meter long. This standard appeared in Samarobriva, modern Amiens, and among the Tungri people. It facilitated trade and construction throughout the region under Roman control.
As governor, Drusus established his headquarters at Lugdunum between 14 and 12 BC. There he decided to create the concilium Galliarum, the council of the Gaulish provinces. This body elected priests to celebrate games and venerate Rome and Augustus as deities every the 1st of August. The altar of the Three Gauls stood at Condate, inaugurated by Drusus in 10 BC. His youngest son Claudius was born in Lugdunum on that same day.