Nero Claudius Drusus Germanicus (38–9 BC), commonly known in English as Drusus the Elder, was a Roman general and politician. He was a patrician Claudian, but his mother was from a plebeian family. He was the son of Livia Drusilla and the stepson of her second husband, the Emperor Augustus. He was also the brother of the Emperor Tiberius; the father of the Emperor Claudius and general Germanicus; paternal grandfather of the Emperor Caligula, and maternal great-grandfather of the Emperor Nero.

Drusus launched the first major Roman campaigns across the Rhine and began the conquest of Germania, becoming the first Roman general to reach the Weser and Elbe rivers. In 12 BC, he led a successful campaign into Germania, subjugating the Sicambri. Later that year, he led a naval expedition against Germanic tribes along the North Sea coast, conquering the Batavi and the Frisii, and defeating the Chauci near the mouth of the Weser. In 11 BC, he conquered the Usipetes and the Marsi, extending Roman control to the Upper Weser. In 10 BC, he launched a campaign against the Chatti and the resurgent Sicambri, subjugating both. The following year, while serving as consul, he conquered the Mattiaci and defeated the Marcomanni and the Cherusci, the latter near the Elbe. His Germanic campaigns were cut short in the summer of 9 BC by his death after a riding accident.

Drusus was a very able commander. His death slowed the northward expansion of the Roman Empire, and foreshadowed the disastrous Battle of the Teutoburg Forest. He was enormously popular among his men, who erected the Drususstein in his honor; his memory was elevated during the reign of his son Claudius. Drusus' accomplishments in battle were considerable. He fought numerous Germanic chiefs in single combat, and was likely the fourth and final Roman to achieve the spolia opima (for taking the armor and weapons of an enemy king after defeating him in single combat), though he died before he could be honored for it.

Early life Childhood Drusus was the youngest son of Livia Drusilla from her marriage to Tiberius Claudius Nero, who was legally declared his father before the couple divorced. Drusus was born between mid-March and mid-April 38 BC, three months after Livia married Augustus on 17 January.Donna W. Hurley, Suetonius: Divus Claudius (Cambridge University Press, 2001), p. 106 Gerhard Radke has proposed the date of 28 March as his most likely birthday,At Divus Claudius 11.3, Suetonius says that Claudius as emperor commemorated the birthday (dies natalis) of his father Drusus on the same date as that of Mark Antony, his maternal grandfather, whose birthday on 14 January, c. 83 BC, had been decreed as a "defective" day (dies vitiosus) by Augustus (Cassius Dio 51.9.3). However, since Drusus's birth is also recorded as occurring within the third month after Livia's marriage to Augustus on 17 January, Radke proposes that Claudius used the astronomical discrepancies between the pre-Julian calendar under which Antony was born and the Julian calendar in effect at the time of Drusus' birth, to show that had the two been born under the same calendar, they would have shared a birthday. Gilbert Rodke (1978), "Der Geburtstag des älteren Drusus," Würzburger Jahrbücher für die Altertumswissenschaft 4 (1978), pp. 211–13. Reviewing these theories, Anthony A. Barrett still considers 14 January the most probable birthdate, explaining the apparent three-month discrepancy as referring to Livia's betrothal, not her marriage . while Lindsay Powell interprets Ovid's Fasti as indicating a date of 13 January. Rumors arose that Augustus was the child's real father, although impossible as Livia was already pregnant when she met her future husband (Emperor Claudius nonetheless encouraged the rumor during his reign to create an impression of more direct lineage from Augustus).

Drusus was raised in Claudius Nero's house with his brother, the future emperor Tiberius, until his legal father's death. The two brothers developed a famously close relationship that would last the rest of their lives. Tiberius named his eldest son after his brother, although eldest sons were usually named after their father or grandfather. Drusus named his second son (future emperor Claudius) after Tiberius.

Name

According to Suetonius, Drusus was originally given the name Decimus as his praenomen, but his full name was later changed to Nero Claudius Drusus. It is not known when or why the change occurred. The names were unusual at the time, both putting heavy emphasis on his maternal ancestry by using Livia's father's cognomen instead of that of her husband; in his original name the use of the praenomen Decimus was also atypical for prevalent families of the late Republic (especially for a patrician). The eventual use of his father's cognomen Nero as a praenomen was highly unconventional as well. His full name given at his Dies lustricus is generally assumed to have been Decimus Claudius Drusus, but some historians such as Andrew Pettinger, Pierre Grimal, T. P. Wiseman, Greg Rowe, Barbara Levick and Eric D. Huntsman believe it may have been Decimus Claudius Nero, Decimus Claudius Nero Drusus or Decimus Claudius Drusus Nero instead.

Livia may have passed down her father's cognomen to her son simply because, besides her adoptive brother Marcus Livius Drusus Libo, there was no one else to pass it down for the future. In 1988 C.J. Simpson asserted that there are three moments in history where the name change is probable to have happened; when his brother Tiberius was adopted by Marcus Gallius, when their father died in 33 BC, or when he assumed the toga virilis. Simpson personally argued against the time of adoption of his brother as a plausible time for his name change since Simpson believed the event may even have happened before Drusus was born; he also rejected the point of death of their father as likely since it would have probably have brought attention to the circumstances surrounding Livia's divorce and remarriage, which had become a part of Mark Antony's propaganda at the time. Simpson stated that in his opinion Livia chose the names Decimus and Drusus for her younger son to minimize association with her ex-husband after she married Octavian due to the former's poor status at the time, but that several years after the man's death it was opportune to emphasize her younger son's connection with his elder brother and that the name change was probably done upon him assuming the toga virilis. Levick believed the adoption of Tiberius necessitated Drusus wearing the name of the Nerones. Simpson responded 1993 in that he believes that Levick's interpretation is incompatible with Suetonius account as he cannot accept that Livia and Octavian (once married) would have allowed the adoption of the boy to take place at all, due to Gallius opposition of Octavian. Since Suetonius makes it clear that Tiberius did use Gallius' name (although briefly) but dropped it out of respect for his stepfather, the adoption must have happened before Drusus was born.

Jean Mottershead proposed in her commentary on Suetonius's Divus Claudius that Drusus' praenomen derived from his father's maternal side of the family, possibly the Junii or Laelii, as they were the only senatorial families who regularly used the praenomen "Decimus". She also believes that the name change happened when his father died and he moved into Octavian's household. Klaus Scherberich is critical of Mottershead's proposal, he argues that there are no examples of a conservative patrician family like the Claudii Nerones adopting a completely new praenomen from a maternal ancestor, especially when said gentes were non-patrician. Scherberich is also sceptical of Simpson's explanation.

Lindsay Powell believes that Drusus personally (despite his young age) may have changed his name directly after his father's death to preserve and honor his memory. In his opinion, another motivation for the boy may have been the meaning of the name Nero, which in ancient Sabine (the language of the people from whom the Claudii descended) meant "strong" or "valiant", a fitting name for a boy from such a distinguished clan.

Marriage

Drusus married Antonia Minor, the daughter of Mark Antony and Augustus' sister, Octavia Minor, and gained a reputation for being completely faithful to her.Valerius Maximus, Factorum ac dictorum memorabilium libri IX IV.3.3 (Latin text). Cited in . Their children were Germanicus, Claudius, a daughter named Livilla ('little Livia'), and at least two others who did not survive childhood. After Drusus' death, Antonia never remarried, though she outlived him by nearly five decades. Three emperors were direct descendants of Drusus: his son Claudius, his grandson Caligula, and his great-grandson Nero.

Career Augustus bestowed many honors on his stepsons. In 19 BC, Drusus was granted the ability to hold all public offices five years before the minimum age. When Tiberius left Italy during his term as praetor in 16 BC, Drusus legislated in his place. He became quaestor the following year, fighting against Raetian bandits in the Alps. Drusus repelled them, gaining honors, but was unable to smash their forces, and required reinforcement from Tiberius. The brothers easily defeated the local Alpine tribes.

Drusus arrived in Gaul in late 15 BC to serve as legatus Augusti pro praetore (governor on Augustus' behalf with the authority of a praetor) of the three Gaulish provinces. His contribution to the ongoing building and urban development in Gaul can be seen in the establishment of the pes Drusianus, or ‘Drusian foot’, of about , which was in use in Samarobriva (modern Amiens) and among the Tungri. From 14 to 13 BC, Augustus himself was also active in Gaul, whether in Lugdunum (modern Lyon) or along the Rhine frontier.

As governor of Gaul, Drusus made his headquarters at Lugdunum, where he decided to establish the concilium Galliarum or ‘council of the Gaulish provinces’ sometime between 14 and 12 BC. This council would elect from its members a priest to celebrate games and venerate Rome and Augustus as deities every 1 August at the altar of the three Gauls that Drusus established at Condate in 10 BC. Drusus' son Tiberius—the future emperor Claudius—was born in Lugdunum on the same day that this altar was inaugurated.

Germanic campaigns

Starting in 14 BC, Drusus built a string of military bases along the Rhine—fifty according to Florus—and established an alliance with the Batavi in preparation for military action in Germania Libera. He is likely to have had seven legions under his command.These were, according to , Legiones I Germanica, V Alaudae, XIII Gemina, XIV Gemina, XVI Gallica, XVII, XVIII, and XIX (the last three being the legions that would later be destroyed while under the command of Varus). In spring of 12 BC, he embarked an expeditionary force, perhaps consisting of the Legiones I Germanica and V Alaudae, by ship from the vicinity of modern Nijmegen, making use of one or more canals he had built for the purpose. Drusus sailed to the mouth of the Ems and penetrated into the territory of the Chauci in present-day Lower Saxony. The Chauci concluded a treaty acknowledging Roman supremacy, and would remain allies of Rome for years to come. As they continued to ascend the Ems, the Romans were attacked by the Bructeri in boats. Drusus' forces defeated the Bructeri, but, as it was now late in the campaign season, turned back for their winter quarters in Gaul, taking advantage of their new alliance with the Frisii to navigate through the difficult conditions on the North Sea.