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Southsea Castle is a mid-sixteenth-century coastal fortress built by Henry VIII between 1544 and 1545 as part of his extensive programme of defensive works against French invasion. The castle comprises a distinctive low, squat structure with multiple gun positions designed to protect the anchorage at Portsmouth Harbour, reflecting the shift in military architecture towards artillery-focused fortification. Originally constructed with a central rounded tower surrounded by bastions, the castle underwent considerable modification during the nineteenth and twentieth centuries, including the addition of casemates and alterations to accommodate changing weaponry and defensive requirements. The site remains largely intact and serves as a physical testament to Tudor military engineering and the strategic importance of the Solent approach during the early modern period.
Southsea Castle is a scheduled monument protected by Historic England under reference 1001869. View the official record →
Southsea Castle is a mid-sixteenth-century coastal fortress built by Henry VIII between 1544 and 1545 as part of his extensive programme of defensive works against French invasion. It is designated a Scheduled Ancient Monument by Historic England (NHLE) under reference 1001869.
Southsea 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 1001869.
Several scheduled monuments lie within 10 km, including Spitbank Fort (1.1 km), Lumps Fort and practice battery (1.5 km), Eastney forts and perimeter defences of barracks (2.5 km).
This page is just one thread. A full Aubrey report pulls together 15 strands of Southsea 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.
Southsea Castle stands on Bracklesham Group And Barton Group (Undifferentiated), bedrock that formed in the Eocene. The rock here is sand, silt and clay.