Legion. He was subsequently transferred, as a senior decurion, to the 1st Alpinorum Cohort,an auxiliary equitata unit based at Carnuntum with the 15th Apollinaris during the reign of Domitian. When Calidius completed his enlistment with the 1st Alpinorum he re-enlisted with the unit, which continued to be based at Carnuntum after the 15th Apollinaris Legion was transferred to the East in AD 113 for Trajan’s Parthian War. Calidius went back to the 1st Alpinorum Cohort at the reduced rank of optio of horse. He died at the age of 58, having served in the Roman military for thirty-four years, and was buried at Carnuntum. [Hold., DRA , ADRH]
XVII. THE CENTURION
The centurio was the key, middle-ranking officer of the Roman army. Julius Caesar considered the centurion the backbone of his army, and knew many of his centurions by name. Apart from some centurions of Equestrian rank during the reign of Augustus, the imperial centurion was an enlisted man like the legionary, promoted from the ranks. One centurion of Equestrian rank was Clivius Priscus, a native of Carecina in Italy, who ended his military career as a first-rank centurion. His son Helvidius Priscus, born around AD 20, became a quaestor, legion commander and praetor.
The centurion originally commanded a century of one hundred men. Centurions commanded the centuries, maniples and cohorts of the legion, with each imperial legion having a nominal complement of fifty-nine centurions, across a number of grades. Julius Caesar’s reward for one particular centurion who had pleased him was to promote him eight grades. The centurion could be identified—by friend and foe alike—by a transverse crest on his helmet, metal greaves on his shins, and the fact that, like all Roman officers, he wore his sword on the left, unlike legionaries, who wore their swords on the right.
The first-rank centurions, or primi ordines , of a legion’s1st cohort, were the most senior in the legion. Promotion came with time and experience, but many centurions never made it to first-rank status. One first-rank centurion in each legion held the title of primus pilus —literally “first spear.” He was chief centurion of the legion, a highly prestigious and well-paid position for which there was always intense competition among centurions. The vastly experienced primi pili always received great respect and significant responsibility, not infrequently leading major army detachments.
Promotion up the various centurion grades involved transfer between various legions. One centurion typically served with twelve different legions during his forty-six-year career throughout the empire. Centurions were also detached from legions to serve as district officers in areas where no legions were based, and were also sent to other legions and auxiliary units as training officers. In AD 83, after a centurion and several legionaries were sent to train a new cohort of Usipi German auxiliaries in Britain, the trainees rebelled, killed their trainers, stole ships and sailed to Europe. The mutineers were subsequently apprehended.
Slaves were not permitted to become legionaries, let alone centurions. In AD 93, time-served centurion Claudius Pacatus was living in retirement when he was recognized as a slave who had escaped many years before. Because of Pacatus’ distinguished military service, the emperor Domitian spared his life, but he returned him to his original master, to live out the rest of his days as a slave.
On their retirement, centurions were eligible for employment as lictors, the attendants of magistrates. This well-paid and prestigious post, renewed annually, involved walking ahead of the officials, and clearing the way, carrying one of their ceremonial fasces , the magistrates’ rods and axes of office.
Many centurions had long careers. Titus Flavius Virilis, a centurion with the 9th Hispana Legion, served for forty-five years before he died at Lambaesis in Africa early in the second century while