==Purpose==Because the Roman Army was not large enough to garrison the vast size of the empire (around 400,000 strong at the beginning of the 3rd century), most of it was stationed along the frontiers.
stoletje===V poznem 4. stoletju, ko je bila napisana "Notitia Dignitatum", je bil prvi oddelek X. legije "Gemina" mobilna poljska enota ("comitatenses") pod poveljstvom "Magistra militum per Orientem".