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Equites singulares Augusti

From Wikipedia, the free encyclopedia

Imperial horseguards (left) escort the emperor Trajan (centre right) on campaign in Dacia (AD 101-5). Detail from Trajan's Column, Rome
Imperial horseguards (left) escort the emperor Trajan (centre right) on campaign in Dacia (AD 101-5). Detail from Trajan's Column, Rome

The equites singulares Augusti (lit: "personal cavalry of the emperor" i.e. imperial horseguards) were the cavalry arm of the Praetorian Guard during the Principate period of imperial Rome. Based in Rome, they escorted the Roman emperor whenever he left the City on a campaign or on tours of the provinces.[1] The Equites Singulares Augusti were a highly trained unit dedicated to protecting the emperor. Men who served in the Equites Singulares Augusti held a Roman public status as "Equites".

Unit History

The unit's origin is uncertain but it appears that they existed during the reign of Trajan 98-117 AD. The unit is documented on Trajan's Column as active in the Dacian Wars (101-AD).[2] It has been suggested that they were formed of Trajan's personal horseguards during his governorship of Germania Superior.

Although designated in inscriptions as a numerus, it appears to have been structured as a regular milliary (i.e. double-strength) ala of the Auxilia, under the command of a tribunus militum, who probably reported to the Praefectus Praetorio, the commandant of the Guard.[3] Initially, it probably contained 720 horsemen, divided into 24 turmae, or squadrons, of 30 men each. Numbers rose to around 1,000 under Hadrian (r. 117-38) and the regiment was expanded to some 2,000 horse in the early 3rd century by the emperor Septimius Severus (ruled AD 197-211).[4]

Their home-base was in Rome, and their permanent camp was on the Caelian Hill. A second, supplementary, camp was built, also on the Caelian, when the unit was expanded under Septimius Severus; this has been excavated underneath the Basilica of San Giovanni in Laterano, Rome (see Castra Nova equitum singularium).

The equites singulares were recruited from serving cavalrymen in the alae of the Auxilia, selected for their quality. As membership of the Praetorian Guard was strictly limited to persons holding Roman citizenship, it appears that recruits to the imperial horseguards were granted citizenship on enlistment, instead of having to serve 25 years to qualify for citizenship as did their fellow alares.[5]

The equipment of the equites singulares was the same as for ordinary auxiliary cavalrymen. From the Great Trajanic Frieze incorporated in the Arch of Constantine in Rome, it appears that the emblem of the equites singulares was the scorpion, which was emblazoned on their standards and (fourfold) on their shields. The scorpion was the birth-sign of the emperor Tiberius, and presumably represented Tiberius' role as 'second founder' of the Praetorian Guard.[6]

It appears that after some campaigns, detachments of singulares were left behind in the provinces, to form the core of new regular alae, which retained the prestigious singulares title and crack reputation e.g. the Ala I Flavia singularium stationed in Raetia in mid-2nd century.[7]

In AD 312, after the defeat of the emperor Maxentius at the battle of the Milvian bridge, the regiment was disbanded, along with the rest of the Praetorian Guard, by the emperor Constantine I (ruled 312-37).[8] The unit may already have become redundant, if the scholae, elite cavalry regiments escorting the emperor, had already been established by the emperor Diocletian (ruled 284-305). Alternatively, the scholae may have been founded by Constantine as a direct replacement for the equites singulares.[9]


  1. ^ Goldsworthy (2003) 58
  2. ^ Rankov (1994) 13
  3. ^ Rankov (1994) 13
  4. ^ Tomlin (1988) 107
  5. ^ Rankov (1994) 14
  6. ^ Rankov (1994) 6, 53 and Plate H
  7. ^ Holder (2003)
  8. ^ Jones (1964) 100
  9. ^ Jones (1964) 613


  • Birley, Anthony (2002). Band of Brothers: Garrison Life at Vindolanda.
  • Goldsworthy, Adrian (2003). Complete Roman Army.
  • Jones, A.H.M. (1964). The Later Roman Empire.
  • Holder, Paul (2003). Auxiliary Deployment in the Reign of Hadrian.
  • Rankov, Boris (1994). Guardians of the Roman Empire.
  • Rossi, L. (1971). Trajan's Column and the Dacian Wars.
  • Tomlin, R. S. O. (1988). "The Army of the Late Empire" in The Roman World (ed J. Wacher).

See also

This page was last edited on 31 December 2021, at 07:33
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