Initially it was Roman, then a little bit of Saxon and then Norman. I know a little bit of history too.
Yep! Portus Adurni - Portchester is the best preserved Saxon Shore fort (chain of fortifications built to control the coastline from The Wash to the Isle of Wight). The curtain wall is still largely Roman (and in bloody good nick). Of course, with the Roman decline, it became part of the Jutish territory of South Hampshire, and then absorbed into the kingdom of the West Seaxe.