Derventio was a Roman settlement at Papcastle on the river Derwent near Cockermouth, Cumbria, England.
In the 12th century the Normans removed Roman stonework from the site and used it to build Cockermouth Castle.
Further archaeological digs were undertaken in 2010 - 2015 which indicate that the Roman settlement was far greater than previously thought.
The indications were that Derventio had been at its peak (and possibly of similar importance to Carlisle or Corbridge) in the late 1st and early 2nd century AD.
The surviving foundations contained significant amounts of worked stone (funerary monuments and statue fragments), which would suggest the bridge to post-date much of the other construction activity.