King John arrived at Wisbech Castle on 12 October 1216. He was traveling from Bishop's Lynn to Lincolnshire, and he had his treasure with him — the royal regalia and other valuables. He stayed one night. Days later, his baggage train got into difficulties crossing a river or estuary somewhere nearby, and the wagons sank. The regalia, the treasure, all of it: gone. John himself died of dysentery a week later. The castle where he spent that last comfortable night still stands, though the building on the site today is a Regency villa from 1816, the fourth or fifth structure to occupy ground where Norman stone replaced Saxon timber, where a bishop's palace replaced a medieval fortress, where a secretary of state's mansion replaced the palace, and where a wealthy merchant's villa replaced the mansion.
William I ordered the castle built in 1072, probably replacing an earlier timber-and-turf structure with stone. The layout was likely oval, its outline still echoed in the circus of streets known as The Crescent that surrounds the site today. The Domesday Book of 1086 makes no mention of a castle here, but the archaeological and documentary record fills in what it omits. Rebuilt in stone in 1087, the castle was reputedly destroyed in a flood in 1236 — a catastrophe that swept away much of the town and drowned hundreds of residents. It was rebuilt again by 1246. King Edward II visited in 1292, 1298, 1300, and 1305, each visit suggesting a structure comfortable enough for royal use but sufficiently familiar that he returned to it repeatedly.
By the Tudor period, the rebuilt castle had become something darker: a notorious prison. During Queen Mary's restoration of Catholicism, Protestants were held here before being removed and burned at the stake. Under Elizabeth I, the roles reversed: Catholic priests filled the cells. In the last years of the 16th century, 33 Catholics were imprisoned at Wisbech Castle, almost all of them priests. Among them were the Jesuit priests Christopher Holywood and William Weston, and a lay brother named Thomas Pounde. The cramped conditions and ideological tensions among the prisoners generated a remarkable internal dispute known as the Wisbech Stirs — a schism in 1594 in which 18 of the 33 prisoners wished to separate themselves and adopt a more communal life. The quarrel, reconciled by November 1595, was observed and documented by those on both sides. Before and after that dispute, two future Gunpowder Plot conspirators — Robert Catesby and Francis Tresham — had reportedly been held here in 1588.
After the Civil War, Cromwell's Secretary of State John Thurloe purchased the castle estate and demolished the bishop's palace to build himself a new mansion — described by a contemporary as "a noble house in the manner of the times." The Restoration returned the estate to the Bishop of Ely. Thurloe's mansion passed through various hands until 1816, when the merchant Joseph Medworth, who had purchased the site at auction in 1793 for £2,305, demolished the mansion and used its materials to build the Regency villa that stands today. The removal of the old building left vaulted cavities below ground that Medworth converted into a terraced garden walk. Those vaults are still there, occasionally opened to visitors, though archaeological investigations have established that they date not to the Norman period but to later phases of the site's development.
The current building — the Regency villa known as The Castle, Museum Square — received Grade II* listed status in 1983. It now stands at the center of The Crescent, the elegant circus of Georgian and Regency townhouses that Medworth and others developed around the castle site. In 2018, Wisbech Town Council took a 30-year lease on the building and began a program of events and school visits. It hosts civil weddings. In 2009, excavations by Oxford Archaeology East unearthed evidence of the medieval structure beneath, and the community archaeology project that followed was Highly Commended at the 2010 British Archaeological Awards. Beneath the current building, the medieval past remains — not entirely gone, just waiting for the right question and the right spade.
Wisbech Castle is located at approximately 52.66°N, 0.16°E in the center of Wisbech, Cambridgeshire, at Museum Square within the circular circus of The Crescent. The distinctive circular street pattern around the castle is visible from the air. Nearest airports: Peterborough/Conington (KNS) approximately 20 miles southwest, Cambridge (CBG) approximately 35 miles south. The River Nene runs through Wisbech and provides a clear navigational reference across the flat Fenland.