Question: What Roman-Britian province inhabited by Celtics Britons, Belgae and Picts, holds the best preserved Roam for north of the Alps?
Sentence (from "Portus Adurni"): 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.
Relevant evidence: No