Portus Adurni
Roman fort / From Wikipedia, the free encyclopedia
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Portus Adurni was a Roman fort in the Roman province of Britannia situated at the north end of Portsmouth Harbour. It was part of the Saxon Shore, and is the best-preserved Roman fort north of the Alps.[1] Around an eighth of the fort has been excavated.[2]
It was later converted into a medieval castle known as Portchester Castle.