For over 500 years , four letters between King Ferdinand of Aragon and one of his commander , Gonzalo Fernandez de Córdoba , have puzzled historiographer . They used a completely unequaled computer code with more than 200 different character to pass along and nobody had been able to crock up it – until now .

The Spanish intelligence agency agency , CNI , has finally been able to   solve the computer code and reveal the message of the commensurateness between the two high - powered piece . The letters date from the time of the Naples War in the first few years of the 1500s , when King Louis XII of France was fighting against Ferdinand and Isabella of Spain for dominion over southerly Italy .

" In the historical situation of that time , in the Naples war , which feign mainly France and Spain , but also the Germanic Empire , the Papal States , the Ottoman Empire and the Italian State Cities , it was essential to keep the secretiveness in the negotiations in military strategies and even in betrayals , and any neglect at one point could disrupt strategies , " Jesús Ansón Soro , the technical secretary of the Museum of the Army of Toledo , where the alphabetic character are on loanword , said in apress group discussion .

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Córdoba , also known as the Great Captain , led Spain ’s military expedition so the commander and the king had to pass on frequently . The four encrypted pieces of chain armor help historiographer sympathize the context of several other letters that have been found . Among the cod ones , there ’s an redundant special one hand - write by the tycoon himself , an super rare determination since the crowned head would have had masses writing letter for him usually .

Cracking the computer code took six months ( not least because some of the letters are 20 page long ) . They discovered 88 different   symbols and 237 combined letter . Some of the symbols corresponded to specific letter , but sometimes it change or corresponded to a whole parole . Sometimes the symbols were even red herring . They were save without infinite or punctuation making the translation even hard . Deciphering the code was possible though thanks to a decipher part in one of the alphabetic character , which became a tonality for the researchers .

The four letters focus on both military and civil matters , discussing a variety of exit . transport troops , collecting taxis , and administering Department of Justice were top precedency in the war but there were also discussion of marrying Spanish officer to southerly Italian widow woman to favor greater social consolidation . The letters also show that Córdoba was fast and obedient to the Billie Jean King .

[ H / T : Radio Television Española ]