In September, a New York auction house had a rare treasure up for sale: a five-centuries-old letter revealing political intrigue involving Hernán Cortés, the famed leader of the Spanish force that colonized what is modern-day Mexico.
Cortés papers seldom come to market. The 1521 document, offered by Swann Galleries, was expected to fetch $20,000 to $30,000. That is, until a plucky group of academics in Mexico and Spain helped thwart the sale.
Searching online catalogues of global auction houses and mining one of the researchers' personal trove . . .
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