Wikipedia:Selected anniversaries/April 26
April 26: Administrative Professionals' Day in Canada and the United States (2006), World Intellectual Property Day.
- 1478 - The Pazzi Conspiracy: Lorenzo and Giuliano of the Medici family were attacked in Florence.
- 1865 - Boston Corbett (pictured) shot and killed John Wilkes Booth, the assassin of U.S. President Abraham Lincoln.
- 1937 - Spanish Civil War: The bombing of Guernica in Spain by the Condor Legion of the German Luftwaffe resulted in a devastating firestorm.
- 1964 - Tanganyika and Zanzibar merged to form Tanzania.
- 1986 - Chernobyl accident: A nuclear reactor in Chernobyl, Ukraine suffered a steam explosion, resulting in a fire and a nuclear meltdown.