description Portchester Castle Overview
Portchester Castle is a medieval fortress at the northern end of Portsmouth Harbour in Hampshire, England. Its Norman keep and later castle buildings stand within the walls of a Roman Saxon Shore fort, whose substantial enclosure remains unusually complete. The site illustrates successive Roman, medieval, and later military use and is open to visitors interested in archaeology and defensive architecture.
help Portchester Castle FAQ
Why is there a medieval castle inside Portchester's Roman walls?
The Normans reused the highly defensible enclosure of a Roman Saxon Shore fort when building their castle. This left Portchester with Roman perimeter walls surrounding a medieval keep and bailey.
How much of Portchester Castle's Roman fort survives?
Its Roman walls and towers are exceptionally complete compared with most forts of the period. The enclosure was built around the late third century to guard Portsmouth Harbour.
Was Portchester Castle ever used as a prison?
Yes. It held prisoners of war during several conflicts, including the Napoleonic Wars. French prisoners created a theatre in the castle while confined there.
What is the church inside Portchester Castle?
St Mary's Church stands within the Roman enclosure beside the castle. It was founded in the 12th century as part of an Augustinian priory.
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