The New Murrey and Blue blog

… for encrypted documents to be found in the French archives, the Bibliotheque Nationale de France. This time, the computerised decoding process revealed the missives to the French Ambassador to contain nouns and verbs in the feminine form, mentions of captivity and of Sir Francis Walsingham, leading the experts to deduce the sender to be Mary, Queen of Scots, briefly Queen Consort of France, who lived in many English gilded cages for nineteen years. We already knew that she wrote several letters in code, some of which were broken by Walsingham and his men, eventually leading to her execution.

John Guy, the leading expert on this unusually tall queen, is quoted in the BBC article.