Queen Victoria visited Penrhyn Castle in 1859 and refused to sleep in the bed prepared for her. It was carved entirely from slate, weighed roughly a ton, and had been commissioned specifically for her stay — a grand gesture that struck her as macabre. “It reminds me of a tomb,” she is said to have remarked, before retreating to a different room. The bed still sits in the castle today, a strange monument to a family whose wealth was, in its own way, built on stone.
Penrhyn’s story begins centuries before the slate bed. In the 12th century, the estate belonged to Ednyfed Fychan, seneschal to Llywelyn the Great, and by the 15th century, his descendant Gwilym ap Griffith had built a fortified hall house on the site overlooking the Menai Strait near Bangor. That medieval manor survived, in modified form, for hundreds of years, passing eventually into the hands of the Pennant family — a name that would come to define the castle entirely.
The Pennant fortune was made in two waves. Richard Pennant, the first Baron Penrhyn, built his wealth on Jamaican sugar plantations worked by enslaved people, and used it to consolidate the fragmented slate pits above Bethesda into what became the Penrhyn Quarry — for a time, the largest slate quarry in the world. His great-nephew George Hay Dawkins Pennant inherited both fortunes and, in the 1820s, decided the old manor house wasn’t nearly grand enough for them.
He commissioned architect Thomas Hopper to rebuild it from the ground up. Rather than follow the fashionable Gothic Revival style of the era, Hopper pursued something rarer: a neo-Norman fantasy, evoking the Romanesque architecture of 11th- and 12th-century England. Construction ran from roughly 1820 to 1837 — fifteen years of quarrying, carving, and craftsmanship that consumed a fortune to produce a building that looked, deliberately, older than it was. Dawkins Pennant died only three years after it was finished, having spent most of his adult life building a castle he barely got to enjoy.
The result is one of the most complete Romanesque Revival buildings in Britain, and its interior is where Hopper’s obsession is most evident. He didn’t stop at the exterior towers and battlements — he extended the Norman theme into the furniture itself, designing chairs, tables, and even carpets in a style meant to evoke medieval Wales, all carved from oak by estate craftsmen. The library and great hall are dense with plasterwork that took years to complete by hand.
Much of the furniture was designed by Hopper and crafted by estate carpenters, with intricate oak carvings visible in tables and chairs, while the striking one-ton slate bed remains a physical reminder of the family’s ties to the slate industry. That bed is Penrhyn’s most peculiar signature piece, a single object that ties together the castle’s architectural ambition and its industrial source of income in one uncomfortable slab.
The art collection is arguably more significant than most visitors expect from a Welsh country house. The paintings include work by Canaletto, Thomas Gainsborough, Sir Joshua Reynolds, Allan Ramsay, and Richard Wilson, alongside a striking depiction of the Penrhyn Slate Quarry itself by Henry Hawkins.
Outside, the grounds hold their own oddities like a 200,000-gallon underground reservoir built in the 1840s, whose exact purpose is still uncertain but which may have supplied the castle’s private fire brigade. The walled garden predates the castle entirely, and a 100-metre Fuchsia Arch, built in the 1880s under longtime head gardener Walter Speed, was once celebrated by Country Life as the estate’s “real glory.”
None of this grandeur has escaped scrutiny. The same fortune that built the castle also funded a quarrying operation whose labor practices produced the Great Strike of 1900–1903, still the longest industrial dispute in British history, and in recent years the National Trust has worked to present that fuller history alongside the architecture, rather than around it.
Penrhyn’s Norman silhouette has made it a natural stand-in for grander, more distant places. Most recently, it played Ashford Castle, the Guinness family’s Irish estate, in Netflix’s 2025 series House of Guinness, Because so little of 19th-century Dublin survives intact, production shifted to North Wales and North West England, with Penrhyn standing in for the Guinness dynasty’s grand home. The castle’s general manager noted the thematic overlap was almost too neat: both properties were built by industrialists to look centuries older than they actually were.
Penrhyn has also appeared closer to home, featuring in the 2022 S4C documentary series Treasures of Wales: Land, Houses and Secrets, which examined the layered and often uncomfortable histories behind some of the country’s grandest houses. It’s a fitting role for a building whose entire existence is an exercise in constructed appearances: a 19th-century castle built to look medieval, funded by industries built to look inevitable, still finding new stories to tell nearly two hundred years after the last stone was set.
The National Trust has opened the castle to the public: https://www.nationaltrust.org.uk/visit/wales/penrhyn-castle-and-garden