Crack the Code!

A young member of the Spanish Royal Family has been posted as an attach´e (a very junior ambassador) at the embassy to France in Paris. At a party, he embarrassed himself when it became known that he did not recognize the name of the famous author Cervantes, nor the name of his most famous work. (Hint: that book is really really famous.) The royal reprimand, sent personally by King Juan Carlos in his personal cipher, has been intercepted. A portion of that encrypted reprimand is printed below

Your challenge is to decrypt this message!

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Frequency Distribution of Ciphertext


Frequency of Spanish (Ñ = 0.17%)

A joint project of Brendan Bard, Prof. Gregory Bard, and Prof. Seth Dutter, University of Wisconsin---Stout (January 30th, 2019)