Allan Mallinson

Who will guard the guards?

Guy de la Bédoyère vividly demonstrates just how dangerously capricious the Roman emperors’ personal troops could be

issue 04 March 2017

The history of an army is essentially the history of its deeds. The history of an army within an army is more intriguing. The Praetorian Guard, a modern term, was founded, or rather formalised, around 27 BC by Augustus for the protection of the emperor and his family. Hitherto, cohors praetoria had been a generic description of the body of troops detailed, ad hoc, for the protection of a general on campaign. This derived from praetorium, the general’s tent next to which they were quartered in camp, which itself derived from praetor, ‘the man who goes before others’. As Gaius Octavius (Octavian) metamorphosed into the first emperor, Augustus, so his cohors praetoria multiplied to become the Praetorian Guard — cohortes praetoriae, the name by which the Romans knew them.

With ten cohorts, each of about 1,000, towards the end of Augustus’s reign — rising perhaps to 15,000 during that of his successor Tiberius — the guard, although relatively small compared with the army as a whole, gradually became the power behind the throne, almost literally so after the building of the Castra Praetoria (to house the cohortes, therefore plural) on the edge of Rome.

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