You can usually take what estate agents say about a ‘unique’ property, or a ‘piece of history’, with a pinch of salt.
But, for once, the agents aren’t exaggerating when it comes to the sale of the island upon which the Magna Carta was signed.
For history buffs with deep pockets, it really is an unmissable opportunity.
A grade II listed building now stands on the site King John signed the document that helped lay the foundations of the rule of constitutional law.
The 1.5ha (3.7-acre) piece of land, surrounded by the Thames, is on the market for £3.95million.
It boasts seven bedrooms, four reception rooms, a swimming pool and more than 400m of river frontage.
In 1215, the nervous monarch chose the spot because he was protected by a circle of walnut trees and a curve of the river which kept enemy longbows out of range.
A chapel was built on the island near Wraysbury, Berkshire, in the 1600s. In 1834, it was extended into a grade II listed house by George Simon Harcourt, lord of the manor and the sheriff of the county.
In 1974, Queen Elizabeth II visited the island and planted a tree in the grounds.
Stuart Cole, of Sotheby’s International Realty, said: ‘This is a once-in-a-lifetime opportunity to buy a piece of world history where the rule of law was first forged.’
And if that isn’t enough history, on the opposite bank are memorials to the Magna Carta and John F Kennedy.