Apparently, she wrote some dirty jokes in her diary.
Answer: In the latest study, the researchers found outbreaks of plague from 1346 through 1837 which could be explained by changes in Asian weather. ... "When the climate subsequently becomes unfavorable, it facilitates the collapse of plague-infected rodent populations forcing their fleas to find alternative hosts.
Explanation: Hope this helped :)
Details? I'm not sure how to answer, without any real information.
On a "Wing-it" situation. I'd say Europe was poor country-wise.
