The legions and the soldiers in them

Foundations · Campaigns · Commanders · Garrisons · Soldiers · Symbols · Transformations
Expanded illustrated edition · 30 October 2026

Rome’s legions were fighting forces, communities of service, centers of administration, builders of roads and fortresses, consumers of provincial resources, and participants in the making of emperors. Their histories crossed generations. A legion might preserve its number and traditions while replacing its personnel, moving to another frontier, changing allegiance, dividing into detachments, or being formally reconstituted after disgrace.

This compendium presents 46 substantial institutional dossiers: the principal permanent legion identities of the late Republic and Principate, together with III Diocletiana. Their careers are set within the broader history of Roman equipment, tactics, auxiliary forces, military infrastructure, and provincial life. The coverage extends from Republican antecedents through the late Roman continuations of these formations. It is not a catalogue of every annually raised Republican legion or every separately named late Roman field regiment.

The length of a dossier reflects the recoverable history. A regiment lost early or founded briefly for an unsuccessful political project cannot honestly be given the same continuous campaign record as one attested across several centuries. Uncertain origins, disputed identifications, and unresolved endings are identified where they affect the history; the surrounding narrative supplies the geographical and institutional context rather than invented incidents.