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A coded letter signed in 1547 by the most powerful ruler in Europe has been cracked by French scientists, revealing that he lived in fear of an assassination attempt by an Italian mercenary.
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February 1547 was a time of rare relative peace between the rival powers of France and the Holy Roman Empire. Emperor Charles V - ruler of vast areas including Spain, the Netherlands, Austro-Hungary and southern Italy - was no longer actually at war with King Francois I. But mistrust still prevailed.
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In the letter, Charles V reveals his concern to maintain the peace with France so that he can focus his forces against the League. He tells the ambassador to keep himself abreast of thinking in the French court, in particular any reaction to the death of King Henry.
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And finally in the longest part of the letter Charles V sets out for his ambassador the current state of play in his campaign against the League. There has been a new outbreak of rebellion in Prague, and the emperor's nephew Ferdinand of Tyrol has been forced to flee.
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And there was no assassination attempt. Charles V died in a Spanish monastery in 1558.