assassination of John the Fearless
1419 CE.
Shown on the map at 48.387°, 2.959°.
John the Fearless, Duke of Burgundy, was assassinated on the bridge at Montereau on 10 September 1419 during a parley with the French Dauphin (the future Charles VII of France), by Tanneguy III du Chastel and Jean Louvet, the Dauphin's close counsellors.
Text from the Wikipedia article Assassination of John the Fearless, licensed CC BY-SA 4.0.