Camulodunum was built into the corner of a junction between two Roman streets. The study concluded that Roman building ruins and old street remains were in some cases used as a template for later property divisions. The name of the town and the River Colne are also a legacy of the Romans. "Colchester" (first appearing in written form in the 10th Century as "Colencaester" and "Colneceastre") is a Saxon name derived from the Latin words "Colonia" and "Castra", with the River Colne also taking its name from "Colonia". Camulodunum Camulodunum (; ), the Ancient Roman name for what is now Colchester
A Town Called Mercy episode was dedicated to figuring out what to do with Jex rather than discovering more about him. Berriman also had two "nitpicks" that arose with the plot; the Gunslinger could just walk into the town and take Jex away, or the Doctor could take Jex away in the TARDIS. Dave Golder of the magazine labelled "A Town Called Mercy" as a "disappointing" science fiction Western episode, writing, "There are some great things about this episode ... But in a show that usually has a lot of fun reinventing TV tropes, too much of "A Town Called Mercy" feels a bit