What Roman-Britian province inhabited by Celtics Britons, Belgae and Picts, holds the best preserved Roam for north of the Alps?
Portus Adurni Portus Adurni was a Roman fortress in the Roman province of Britannia situated at the north end of Portsmouth Harbour. Listed in the Notitia Dignitatum, it is generally accepted as having been located at grid reference [ SU624045] adjoining Portchester in the English county of Hampshire and was later converted into a medieval castle known as Portchester Castle. It is the best preserved Roman fort north of the Alps.
Hardknott Roman Fort Hardknott Roman Fort is an archeological site, the remains of the Roman fort "Mediobogdum", located on the western side of the Hardknott Pass in the English county of Cumbria (formerly part of Cumberland).