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We are all aware of so called Mayerling incident.
http://en.wikipedia.org/wiki/Mayerling_Incident
Heir of throne of Austro-Hungary Archduke Rudolf apparently commited suicide in 1889. with his mistress Maria Vechera.
But, what id he didn't do that?
BTW. What do you think did really happen that night?
( I know that the POD is pre-1900, but butterflies will mostly be after-1900 )