List of Roman legions
The list below includes legions of the late Republic and the Empire. It is a list of individual units, not the army’s composition at a single date: legions were raised, disbanded, destroyed and renamed.
Under the Principate most legions were based in the provinces, particularly along the frontiers. Italy was not entirely excluded, however: under Septimius Severus, Legio II Parthica acquired a base near Rome in the Alban Hills.
A number was not always unique. Unit names could reflect origin, a station, a founder or an honorary distinction. During civil wars different legions could have the same number. For IIII, VIIII, XIIII and other ancient forms, see Roman numerals.
Map with the location of the legions in 125 AD.Legio I Adiutrix Legio I Germanica Legio I Italica
Legio I Parthica Legio II Adiutrix Legio II Herculia
Legio II Parthica Legio II Traiana Fortis Legio II Augusta Legio III Augusta Legio III Cyrenaica Legio IIII Flavia Felix Legio IIII Macedonica
Legio IIII Scythica Legio V Alaudae Legio V Macedonica Legio VI Ferrata Legio VI Victrix Legio VII Claudia Legio VIII Augusta Legio IX Hispana Legio X Fretensis Legio X Gemina Legio XI Claudia Legio XII Fulminata Legio XIII Gemina Pia Fidelis Legio XIIII Gemina Martia Victrix Legio XV Apollinaris Legio XVI Flavia Firma Legio XVI Gallica Legio XVII Legio XVIII Legio XIX Legio XX Valeria Victrix Legio XXI Rapax Legio XXII Deiotariana Legio XXII Primigenia Legio XXX Ulpia Victrix
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