A 710-year-old copy of the Magna Carta has sold at auction for more than 21 million dollars.
The historic declaration of human rights is one of 17 known copies.
A spokesman for the New York auction house Sotheby's says the tract, which was owned by the Perot Foundation, was purchased by David Rubenstein of The Carlyle Group, a private equity firm.
The document bears the seal of King Edward I and is dated 1297. It is one of two that exist outside Britain; the other is in Australia.
From 1988 until earlier this year it was on loan to the National Archives in Washington, sharing space with the Declaration of Independence and the U.S. Constitution, two documents that drew on its principles.