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Portchester Castle is a medieval fortification situated on a peninsula in Portsmouth Harbour, Hampshire, built within the walls of a Roman fort. The castle was established in the late twelfth century as a royal fortress, with the rectangular keep constructed under Henry II around 1160 to 1170. The structure comprises a substantial stone keep and residential ranges enclosed by the reused Roman fortification walls, which date from the third century and represent one of the best-preserved examples of late Roman military architecture in Britain. Portchester served as an important administrative and military centre throughout the medieval period, and the site retains significant archaeological and architectural evidence of both its Roman and Norman phases.
Portchester Castle is a scheduled monument protected by Historic England under reference 1015698. View the official record →
Portchester Castle is a medieval fortification situated on a peninsula in Portsmouth Harbour, Hampshire, built within the walls of a Roman fort. It is designated a Scheduled Ancient Monument by Historic England (NHLE) under reference 1015698.
Portchester Castle is a Scheduled Ancient Monument, legally protected by Historic England (NHLE) — the body responsible for designating and safeguarding heritage sites in England. The official designation reference is 1015698.
Several scheduled monuments lie within 10 km, including Long Curtain, King's Bastion and Spur Redoubt (5.5 km), Gunboat Traverser System (5.6 km), No 1 Battery, Stokes Bay Lines (6.7 km).
This page is just one thread. A full Aubrey report pulls together 15 strands of Portchester Castle's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Portchester Castle stands on White Chalk Subgroup, bedrock that formed in the Maastrichtian. The rock here is chalk.