Portchester's a small suburb to the northwest of Portsmouth, England. It's part of the borough of Fareham in Hampshire. Once a small village, Portchester's now a busy part of the expanding conurbation between Portsmouth and Southampton, on the A27 main thoroughfare. Its population according to the 2001 Census was approximately 17,000 residents. The fort of Portus Adurni, now Portchester Castle,'s arguably the finest example of a Roman fort in Western Europe and continued in use over the next si… (More on Portchester)