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In 1547, Holy Roman Emperor Charles V penned a letter to his ambassador, Jean de Saint-Mauris, part of which was written in the ruler's secret code. Nearly five centuries later, researchers have ...
French historians crack mysterious code in letter from Charles V - RFI - Radio France Internationale
A team of researchers has cracked the secret code used by Charles V, Holy Roman Emperor and King of Spain, in a letter that has puzzled historians for nearly 500 years.
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