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Cat's eradication
The cat's eradication, linked to beliefs of sorcery, allowed the spread of plague.
The dirty sun
Louis XIV (known as the sun king) took only one bath in his life: in 1665.
Doctors thought that the skin was porous, hence washing was considered dangerous. This century was in fact more dirty than the middle-age.
(*) If you are friendless, this my be the right thing to start gather some!