The Treaty of Florence was signed, which ended the war between the French Republic and the Kingdom of Naples.
Source
The strain of swine flu known as H1N1 had its first case in the US.
The world's first weightlifting championship took place in London, England.
The UK issued a new 12-sided £1 coin into circulation.
Roman Emperor Valentinian I made his brother, Flavius Valens, his co-emperor.
The term ''Big Bang" was coined by Fred Hoyle in a radio interview.