The Treaty of Florence was signed, which ended the war between the French Republic and the Kingdom of Naples.
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Roman Emperor Valentinian I made his brother, Flavius Valens, his co-emperor.
The world's first weightlifting championship took place in London, England.
The world's largest dinosaur footprint was discovered.
A nuclear disaster occurred at Three Mile Island in Pennsylvania, US.
The term ''Big Bang" was coined by Fred Hoyle in a radio interview.
