Legio vigesima Valeria victrix, in English Twentieth Victorious Valeria Legion was a legion of the Imperial Roman army. The origin of the Legion's name "Valeria" is unclear and there are various theories. The legion was probably founded shortly after 31 BC by the emperor Augustus. It served in Hispania, Illyricum, and Germania before participating in the invasion of Britannia in 43 AD. It remained active in Britain 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.