Harvard thought it had a cheap copy of the Magna Carta. It turned out be extremely rare

Harvard University for decades assumed it had a cheap copy of the Magna Carta in its collection, a stained and faded document it had purchased for less than $30. The original Magna Carta established in 1215 the principle that the king is subject to law, and it has formed the basis of constitutions globally. “My reaction was one of amazement and, in a way, awe that I should have managed to find a previously unknown Magna Carta,” said David Carpenter, a professor of medieval history at King’s College London.