Wikipedia:Selected anniversaries/May 15
May 15: Independence Day in Paraguay (1811), Teachers' Day in Mexico and South Korea, Nakba Day in Palestinian communities.
- 1252 - Pope Innocent IV issued the papal bull ad exstirpanda, authorizing the use of torture on heretics during the Inquisition.
- 1756 - Seven Years' War: Britain declared war on France, two years after fighting began at the Battle of Jumonville Glen in the Ohio Country.
- 1928 - Cartoon characters Mickey and Minnie Mouse made their movie debut in Plane Crazy.
- 1934 - Prime Minister Kārlis Ulmanis dissolved the Saeima and established an authoritarian rule in Latvia.
- 1990 - Vincent van Gogh's Portrait of Dr. Gachet (pictured) was sold for US$82.5 million, at the time the world's most-expensive painting.