Wikipedia:Selected anniversaries/April 1
April Fool's Day
- 527 - Byzantine Emperor Justin I named Justinian I as co-ruler and successor.
- 1789 - The U.S. House of Representatives held its first quorum in New York City and elected Frederick Muhlenberg as the first Speaker.
- 1826 - The internal combustion engine was patented by Samuel Morey.
- 1945 - World War II: The Battle of Okinawa, the largest amphibious assault during the Pacific campaign, began in Okinawa, Japan.
- 1979 - Iran was proclaimed an Islamic republic, a theocracy led by Ayatollah Ruhollah Khomeini as the Supreme Leader of Iran.
Recent days: March 31 – March 30 – March 29
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