Roman auxiliaries

Foederati ( ; singular: foederatus ) were peoples and cities bound by a treaty, known as foedus, with Rome. During the Roman Republic, the term identified the socii, but during the Roman Empire, it was used to describe foreign states, client kingdoms or barbarian tribes to which the empire provided benefits in exchange for military assistance. The term was also used, especially under the empire, for groups of barbarian mercenaries of various sizes who were typically allowed to settle within the empire.

thumb|300px|Roman auxiliary infantry crossing a river, probably the Danube, on a [[pontoon bridge during the emperor Trajan's Dacian Wars (101–106 AD). They can be distinguished by the oval shield (clipeus) they were equipped with, in contrast to the rectangular scutum carried by legionaries. Panel from Trajan's Column, Rome]] The '''''' (, ) were introduced as non-citizen troops attached to the citizen legions by Augustus after his reorganisation of the Imperial Roman army from 27 BC. By the 2nd century, the contained the same number of infantry as the legions and, in addition, provided

A vexillatio (: vexillationes) was a detachment of a Roman legion formed as a temporary task force created by the Roman army of the Principate. It was named from the standard carried by legionary detachments, the vexillum (: vexilla), which bore the emblem and name of the parent legion.

Roman allied military unit

Mounted forces during Ancient Rome

Roman military unit

Roman imperial guard unit

Wikimedia list article