Legio XX Valeria Victrix
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Legio vigesima Valeria Victrix (Twentieth Victorious Valerian Legion) was a Roman legion, probably raised by Augustus some time after 31 BC. It served in Hispania, Illyricum, and Germania before participating in the invasion of Britannia in 43 AD. It remained active in the province until at least the beginning of the 4th century. The legion, which had a boar as its emblem, was based at the fortress of Deva Victrix, which is now the present-day city of Chester.
Valeria in east-central Europe was a part of Illyricum when the legion was stationed there. The legion won its title from victories in this region while campaigning in the Marcomannic Wars. (Later, in the year 296, Valeria became a separate Province.)
The legion then moved to Illyricum, and is recorded in the army of Tiberius operating against the Marcomanni in AD 6. From there, they were withdrawn to fight the Pannonian uprising. In Illyria they were led by the governor of Illyricum Marcus Valerius Messalla Messallinus, who may have given his clan (gens) name Valeria to the legion. Although understrength, they managed to defeat the rebels led by Bato of the Daesitiates.
In one battle the legion cut through the enemy lines, was surrounded, and cut its way out again.
The legion was one of the four with which Claudius invaded Britain in 43. It was also one of the two legions that defeated Caratacus at the Battle of Caer Caradoc, after which, from the AD 50s, it was encamped at Camulodunum, with a few units at Kingsholm in Gloucester and a garrison at Wroxeter. In AD 60 or 61 the XX helped put down the revolt of queen Boudica, after having routed the Ordovice by crossing Menai Strait in Wales to destroy the Druids' sacred groves in 58.
The legion was then based at Deva Victrix.
In the year of the four emperors, the legion sided with Vitellius. Some units went with him to Rome. In 78-84 AD, the legion was part of Gnaeus Julius Agricola's campaigns in northern Britain and Scotland, and built the base at Inchtuthil. In 88 AD the legion returned south and occupied Castra Devena Deva Victrix, where it remained for at least two centuries.
The Twentieth was among the legions involved with the construction of Hadrian's Wall, and the discovery of stone altars commemorating their work in Caledonia suggests that they had some role in building the Antonine Wall.
During the reign of the usurper emperors Carausius and Allectus (286-293 and 293-296 AD) the XX Valeria Victrix was still active. No further information is known after this period and scholars believe the XX legion was still stationed in Britain when the usurper Constantine III pulled the bulk of the military forces from there in the year 407 for his doomed campaign on the continent.
This legion has been much studied; at least 250 members of the legion have been identified in surviving inscriptions.
Legio XX Valeria Victrix and their final days in Deva (Chester) in the early 400s AD form the backdrop to the Tom Stevens mythic-fiction genre novel 'The Cauldron' (special edition) with the story's protagonist Valerian - the Praefectus and Chief Centurion defending the city with the rump of the legion against the incursions of Hibernian pirates as the 'Dark Ages' settle on Britannia  The movie 'Victrix! The Valiant of Albion' is in production and features an adaptation of Tom Stevens novel Victrix! The Valiant of Albion
Several of the main characters in the early novels of Jack Whyte's A Dream of Eagles series were former members of Legio XX Valeria Victrix.
Gaius Petreius Ruso, protagonist of Medicus by Ruth Downie is a military doctor in Britannia attached to Legio XX.
Legio XX Valeria Victrix lends its name to the character Valeria Matuchek in Poul Anderson's Operation Chaos and its sequel Operation Luna; her mother is said to describe this legion as the last to leave Britain -- "the last that stood against Chaos."
The first person narrator of Stephen Vincent Benét’s short story The Last Of The Legions is the senior centurion of the Valeria Victrix, who recounts the events and the impressions of soldiers and populace surrounding the departure of the legion from Britain.
- Velleius Paterculus, 2.112.1-2, Cassius Dio, 55.30.1-5.
- W H Manning 2000 'The fortresses of Legio XX'. In RJ Brewer (ed) Roman Fortresses and their legions.
- Moffat, Alistair (2005). Before Scotland. Thames & Hudson. pp. 243–245. ISBN 978-0-500-05133-7.
- (special edition) ISBN 978-0-9559656-1-6