May 9: Europe Day, Victory Day in various Eastern European countries.
Victory Day Poster
- 328 - Athanasius became the Patriarch of Alexandria.
- 1092 - Lincoln Cathedral in Lincolnshire, England was consecrated.
- 1901 - The first Parliament of Australia opened in the Royal Exhibition Building in Melbourne.
- 1945 - Victory Day: following the general capitulation to the Allies and on the Soviet insistence the forces of Nazi Germany specifically surrender to the Soviet Union.
- 1946 - King Victor Emmanuel III of Italy abdicated.
- 1950 - Dianetics: The Modern Science of Mental Health by L. Ron Hubbard, the founder of Scientology and Dianetics, was first published.