Rare and authentic Magna Carta discovered long after it was purchased for $27.50

A "copy" of the famous document known as a symbol against tyranny and as a "cornerstone of freedom" has been discovered to be authentic.

Harvard Law School in 1946 bought a "copy" of the Magna Carta for just $27.50 from a London legal book dealer, Sweet & Maxwell, according to a news release.

British researchers from King’s College London and the University of East Anglia made the discovery while studying unofficial copies of Magna Carta.

ANCIENT ROMAN MILITARY FORTIFICATIONS...