Princess Isabella of Parma exchanged hundreds of letters with her sister-in-law that implied the pair's relationship was more than friendly. A portrait of Princess Isabella of Parma. The pair exchanged letters "constantly" back and forth over the years, according to Making Queer History, and many of them are believed to be queer-coded or romantically affectionate in nature. "I cannot tolerate this uncertainty, I can think of nothing but that I am madly in love," Princess Isabella reportedly wrote in one letter. After two miscarriages, Princess Isabella was pregnant for a fourth time when she died from smallpox at the age of 21 in 1763.

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Persons: Princess Isabella of Parma, Isabella of Parma, Archduke Joseph of Austria, Archduchess Maria Christina, Princess Isabella, Maria's, Prince Albert