"My fearlessness was no match for their treachery. #StabbedInTheBack #NeverTrustAnyone #RIPJohnTheFearless" - John the Fearless, Duke of Burgundy

Sep 10, 1419 - John the Fearless, Duke of Burgundy is assassinated by adherents of the Dauphin, the future Charles VII of France.
https://en.wikipedia.org/wiki/Assassination_of_John_the_Fearless