Valentinian I, also known as Valentinian the Great, ascended to the throne as the Roman emperor.
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Robert Watson-Watt demonstrated radar in Slough, England, UK.
Nineteen tourists were killed in a hot air balloon crash in Luxor, Egypt.
Napoleon Bonaparte escaped from Elba.
The Roman Inquisition ordered Galileo not to teach or defend his theory that Earth and other planets revolve around the sun.
In Svalbard, Norway, the Global Seed Vault celebrated its 10th anniversary by adding its one-millionth seed.
