Deva Victrix, or simply Deva, was a legionary fortress and town in the Roman province of Britannia. The settlement evolved into Chester, the county town of Cheshire, England. The fortress was built initially by the Legio II Adiutrix in the AD 70s as the Roman army advanced north against the Brigantes, but completed over the next few decades by the Legio XX Valeria Victrix.