Roman Military Command and Recruitment under the Principate (27 BCE–235 CE)

1. Augustus begins Principate and army reorganization

   Jan 1, 27 BCELabels: Augustus, First Settlement

   • Britannica
   • Roman province

2. Legions reduced and made a standing force

   Jan 1, 25 BCELabels: Legions, Standing Army

   • Roman legion
   • Benario

3. Augustus granted imperium maius

   Jan 1, 23 BCELabels: Augustus, Imperium Maius

   • Britannica
   • WorldHistory biz

4. Fixed service terms and discharge bonuses introduced

   Jan 1, 13 BCELabels: Honesta Missio, Discharge Bonuses

   • Augustan Empire
   • Honesta missio

5. Aerarium militare founded to fund veterans

   Jan 1, 6Labels: Aerarium Militare, Augustus

   • Aerarium militare
   • Vicesima

6. Illyrian Revolt forces emergency recruitment

   Jan 1, 6Labels: Great Illyrian, Emergency Levies

   • Britannica
   • Imperial army

7. Teutoburg Forest defeat reshapes deployments

   Sep 1, 9Labels: Teutoburg Forest, Varus Disaster

   • Britannica
   • Roman legion

8. Sejanus concentrates Praetorians in Castra Praetoria

   Jan 1, 23Labels: Sejanus, Castra Praetoria

   • Castra Praetoria
   • Britannica

9. Claudius regularizes auxiliary service and rewards

   Jan 1, 52Labels: Claudius, Auxilia

   • Diploma
   • ImperiumRomanum

10. Military diplomas begin being issued

    Jan 1, 52Labels: Military Diploma, Auxilia

    • Diploma
    • Britannica

11. Italian dominance in legion recruitment declines

    Jan 1, 96Labels: Legion Recruitment, Provincialization

    • Imperial army
    • WarHistory

12. Equites singulares Augusti attested under Trajan

    Jan 1, 101Labels: Equites Singulares, Trajan

    • Equites singulares
    • Trajan Column

13. Septimius Severus replaces the Praetorian Guard

    Jun 1, 193Labels: Septimius Severus, Praetorian Guard

    • Septimius Severus
    • Praetorian Guard

14. Constitutio Antoniniana expands legion recruiting pool

    Jan 1, 212Labels: Constitutio Antoniniana, Caracalla

    • Britannica
    • Constitutio

15. Maximinus Thrax’s accession ends Principate era

    Mar 1, 235Labels: Maximinus Thrax, End Principate

    • Britannica
    • Britannica