On this date in 1945, eponymous Nazi collaborator Vidkun Quisling was shot at Oslos Akershus Fortress for high treason. By the time of his death, the Nazi collaborator (English Wikipedia page | Norwegian) had already given his surname to English and other languages as a synonym for traitor. Just deserts for his efforts as chief of the fascist party Nasjonal Samling to aid the Nazi conquest of his home country.