Silius was probably son of Publius Silius Nerva. In AD 13, Silius was elected consul alongside Lucius Munatius Plancus. At the end of his tenure in office, he was appointed imperial legate of Germania Superior, under the overall command of Germanicus, and was the officer in charge of the four upper Rhine legions which did not mutiny upon the death of the emperor Augustus. Once the mutiny was suppressed, Silius continued to serve loyally under Germanicus, participating in the Roman retaliation campaign (between AD 14-16) against a Germanic alliance in the aftermath of the disaster at the Battle of the Teutoburg Forest. His successes earned him an honorary triumph in AD 15.
The following year, Germanicus sent Silius against the Chatti with 30,000 infantry and 3,000 cavalry, defeating them in the process., after which Tiberius appointed him as a taxation auditor in Gaul.[dubious ] He continued in his role as governor of Upper Germany until 21, during which he put down a revolt in Gaul when a faction of Treveri, led by Julius Florus and allied with the Aeduan Julius Sacrovir, led a rebellion of Gaulish debtors against the Romans in 21. With two legions Silius defeated Sacrovir’s rebel forces (numbering 40,000) twelve miles outside of Augustodunum.
Upon his return to Rome in 21, Silius was soon caught in the political machinations at court as part of Germanicus’s faction. Through Silius’s wife, Sosia Galla, the couple had become friends with Tiberius’ daughter-in-law Agrippina the Elder. Due to their friendship with Agrippina they became innocent victims of Sejanus' treason trials. In the Senate, Silius was accused by the consul Lucius Visellius Varro of being complicit in Sacrovir’s revolt, and of misappropriating money from the provincial government in Gaul. Refusing to submit a plea or to defend himself, he declared that had he not personally kept the legions on the Rhine from avenging the murder of Germanicus, Tiberius would have lost his position as Princeps. Faced with false witnesses swearing that he had robbed the Gallic provinces, Silius committed suicide in 24, and afterwards Galla was exiled. Galla's property was confiscated by the Senate and a portion was given to her children.
Silius had at least one son, also named Gaius Silius.
Germanicus Iulius Caesar and Gaius Fonteius Capito
|Consul of the Roman Empire
with Lucius Munatius Plancus
Sextus Pompeius and Sextus Appuleius
- Smith, William, Dictionary of Greek and Roman Biography and Mythology, Vol III (1849).
- Diana Gorostidi Pi, Zeitschrift für Papyrologie und Epigraphik, 189 (2014), pg 265-275.
- Munat(ius) Plan(cus) C(aius) S[ilius] / suf(fectus) Caecina.
- Christopher Burnand, Tacitus and the Principate: From Augustus to Domitian (2011), pg. 56
- Pat Southern, The Roman army: a social and institutional history (2007), pg. 294
- Smith, pg. 823
- Ludwig Heinrich Dyck, The Roman Barbarian Wars: The Era of Roman Conquest (2011), pg. 256
- Stephen Dando-Collins, Blood of the Caesars: how the murder of Germanicus led to the fall of Rome, (2008), pg. 96
- Tacitus, Annales III:40-42.
- David F. Burg, A world history of tax rebellions: an encyclopedia of tax rebels, revolts, and riots from antiquity to the present (2004), pg. 25
- Smith, pg. 823
- Jasper Burns, Great women of Imperial Rome: mothers and wives of the Caesars (2007), pgs. 51-52
- Stephen Dando-Collins, Blood of the Caesars: how the murder of Germanicus led to the fall of Rome, (2008), pg. 97
- Smith, pg. 823
- Jasper Burns, Great women of Imperial Rome: mothers and wives of the Caesars (2007), pg. 52