He places Cirencester in their territory, while both Bath and Winchester belonged to the Belgae. To secure Winchester, where they would be on the line of the tin-trade road (see p. 36), would be the first object of the Romans if they did land at Portsmouth. Their further steps would depend upon the disposition of the British armies advancing to meet them,—the final objective of the campaign being Camelodune, the capital of the sons of Cymbeline.
This is stated by both Geoffrey of Monmouth and Matthew of Westminster.
For three centuries this legion was quartered at Caerleon-upon-Usk, and the Twentieth at Chester. See Mommsen, 'Roman Provinces,' p. 174.
This was the honorary title of several legions; as there are several "Royal" regiments.