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.
The UK had its first Grand National Steeplechase at Aintree Racecourse in Liverpool.
Michael Jackson's 'Thriller' hit number one on the Billboard 200 and stayed there for 37 weeks.
£1 notes were circulated in Britain.
The Roman Inquisition ordered Galileo not to teach or defend his theory that Earth and other planets revolve around the sun.
