Roman Emperor Valentinian I made his brother, Flavius Valens, his co-emperor.
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The UK issued a new 12-sided £1 coin into circulation.
The European Union Parliament declared single-use plastics were to be banned by 2021.
Stanley Kramer became the first person to receive a star on the Hollywood Walk of Fame.
The term ''Big Bang" was coined by Fred Hoyle in a radio interview.
Bank of Tokyo and Mitsubishi Bank merged to become the world's largest bank.
