The ''primus pilus'' or ''primipilus'' was the senior

centurion A centurion (; la, centurio , . la, centuriones, label=none; grc-gre, κεντυρίων, kentyríōn, or ) was a position in the Roman army during classical antiquity, nominally the commander of a century (), a military unit of around 80 ...

of the first

cohort Cohort or cohortes may refer to: * Cohort (educational group), a group of students working together through the same academic curriculum * Cohort (floating point), a set of different encodings of the same numerical value * Cohort (military unit ...

in a

Roman legion The Roman legion ( la, legiō, ) was the largest military unit of the Roman army, composed of 5,200 infantry and 300 equites (cavalry) in the period of the Roman Republic (509 BC–27 BC) and of 5,600 infantry and 200 auxilia in the period of ...

, a formation of five double-strength centuries of 160 men, was called the ''primus pilus''; he was a career soldier and advisor to the

legate Legate may refer to: *Legatus, a higher ranking general officer of the Roman army drawn from among the senatorial class :*Legatus Augusti pro praetore, a provincial governor in the Roman Imperial period *A member of a legation *A representative, ...

. The ''Primus Pilus'' would remain in command for one year. They could continue to serve in the army after their term ended if there was a vacancy in command or if they wished to become an independent commander of an ''

auxilia The (, lit. "auxiliaries") were introduced as non-citizen troops attached to the citizen legions by Augustus after his reorganisation of the Imperial Roman army from 30 BC. By the 2nd century, the Auxilia contained the same number of inf ...

'' unit or the ''

praefectus castrorum The ''praefectus castrorum'' ("camp prefect") was, in the Roman army of the early Empire, the third most senior officer of the Roman legion after the legate (''legatus'') and the senior military tribune (''tribunus laticlavius''), both of whom w ...

''. During the

Roman Empire The Roman Empire ( la, Imperium Romanum ; grc-gre, Βασιλεία τῶν Ῥωμαίων, Basileía tôn Rhōmaíōn) was the post-Republican period of ancient Rome. As a polity, it included large territorial holdings around the Mediterr ...

, emperor Claudius created the office of ''primus pilus iterum''. To become the ''primus pilus iterum'' an officer must have formerly served as a tribune in the ''

vigiles The ''Vigiles'' or more properly the ''Vigiles Urbani'' ("watchmen of the City") or ''Cohortes Vigilum'' ("cohorts of the watchmen") were the firefighters and police of ancient Rome. History The ''Triumviri Nocturni'' (meaning ''three men of th ...

'', ''

cohortes urbanae The ''cohortes urbanae'' (Latin meaning ''urban cohorts'') of ancient Rome were created by Augustus to counterbalance the enormous power of the Praetorian Guard in the city of Rome and serve as a police service. They were led by the Praefectus ur ...

'', or

Praetorian Guard The Praetorian Guard (Latin: ''cohortēs praetōriae'') was a unit of the Imperial Roman army that served as personal bodyguards and intelligence agents for the Roman emperors. During the Roman Republic, the Praetorian Guard were an escort fo ...

. The ''primus pilus iterum'' would hold the responsibility of a

Praefectus castrorum The ''praefectus castrorum'' ("camp prefect") was, in the Roman army of the early Empire, the third most senior officer of the Roman legion after the legate (''legatus'') and the senior military tribune (''tribunus laticlavius''), both of whom w ...

but with higher pay. The ''primus pilus'' was a well paid position. They could accumulate enough wealth to become part of the

equestrian class The ''equites'' (; literally "horse-" or "cavalrymen", though sometimes referred to as "knights" in English) constituted the second of the property-based classes of ancient Rome, ranking below the senatorial class. A member of the equestrian o ...

. Even if they failed to gather such wealth, they were promoted to the equestrian class after retiring. Only eight officers in a fully officered legion outranked the ''primus pilus'': The legate ('' lēgātus legiōnis''), commanding the legion; the senior tribune (''

tribunus laticlavius In the Roman army of the late Republic and the Principate, the ("broad-striped tribune") was one of the six military tribunes in a legion. Usually, they were a young man around the age of 20 that belonged to a wealthy family. Or they were friend ...

''); the Camp Prefect (''

''); and the five junior tribunes (''

tribuni angusticlavii A ''tribunus angusticlavius'' ("narrow-striped tribune"; plural: ''tribuni angusticlavii'') was a senior military officer in the Roman legions during the late Roman Republic and the Principate. The ''tribunus angusticlavius'' was a junior military ...

''). The ''primus pilus'' centurion had a place in the war councils along with the military tribunes and the Legate.

References

Ancient Roman titles Military ranks of ancient Rome {{mil-rank-stub