Wikipedia:Selected anniversaries/June 9
June 9: St. Colmcille's Day in Ireland
- 68 - Roman Emperor Nero (pictured) committed suicide after he was deposed by the Senate.
- 1310 - Italian artist Duccio's Maestà with Twenty Angels and Nineteen Saints, a seminal artwork of the early Italian Renaissance, was unveiled and installed in Cathedral of Siena in Siena, Italy.
- 1815 - The Congress of Vienna ended, redrawing the political map of Europe after the defeat of Napoleon in the Napoleonic Wars.
- 1856 - Mormon pioneers left Iowa City, Iowa and headed west for Salt Lake City, Utah, carrying all their possessions in two-wheeled handcarts.
- 1934 - Donald Duck debuted in The Wise Little Hen.
- 1986 - The Rogers Commission released its report on the Space Shuttle Challenger disaster, concluding that the accident was caused by the faulty design of the solid rocket booster O-rings.