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He subdued the Silures and other tribes of Wales hostile to Roman invasion, establishing a new base at Caerleon or Isca Augusta for Legio II Augusta and a network of smaller forts fifteen to twenty kilometres apart for his auxiliary units.
Isca is derived from a Brythonic Celtic word for flowing water, which was given to the Exe as well as to the River Usk (Welsh: Afon Wysg) in South Wales, on which Caerleon (known to the Romans as Isca Augusta) stands.
(b) the main Roman army bases: the three permanent fortresses housing the legions (castra legionaria): York (Eboracum), base of the Ninth Legion: Legio IX Hispana, later the Sixth: Legio VI Victrix; Chester (Deva), base of the Twentieth: Legio XX Valeria Victrix; and Caerleon (Isca Augusta), base of the Second: Legio II Augusta.