Camulodunum pavements. It may have reached a population of 30,000 at its height. It was not until the late 18th century that historians realised that Colchester's physical Brythonic (British Celtic) and Roman remains were the city mentioned in ancient literature as "Camulodunum". The earliest Iron Age defensive site at Colchester is the Pitchbury Ramparts earthwork north of the town between West Bergholt and Great Horkesley. The main earthwork defences of the Brythonic Celtic oppidum of "Camulodunon" were built later, beginning in the 1st century BC but most date from the 1st century AD. They are considered the most extensive of their
A Town Called Mercy called the Gunslinger. However, the Gunslinger is a product of experiments by Jex to win a civil war on his planet, and the Doctor is unsure of what is the right thing to do. Showrunner Steven Moffat pitched the Wild West theme to Whithouse when thinking of ways to give each episode a distinct theme. Whithouse further developed the theme, including classic Western tropes and a sympathetic villain. "A Town Called Mercy" and the previous episode "Dinosaurs on a Spaceship" were the first to enter production for the seventh series. Much of the episode was filmed in March 2012 in