768: Charlemagne and his brother Carloman I are crowned Kings of The Franks

1000: Leif Ericson discovers “Vinland” (possibly L’Anse aux Meadows, Canada) reputedly becoming first European to reach North America

1446: The Hangul (Korean) alphabet is first published in Korea by King Sejong the Great

1831: Ioannis Kapodistrias, first Head of State of modern Greece, assassinated in Nafplion

1941: US President Franklin D. Roosevelt approves an atomic program that would become the Manhattan Project

2006: North Korea conducts its first nuclear test, with an estimated yield of between 0.4-2 kilotons

Source: Onthisday.com