Valentinian I, also known as Valentinian the Great, ascended to the throne as the Roman emperor.
Source
Nineteen tourists were killed in a hot air balloon crash in Luxor, Egypt.
Robert Watson-Watt demonstrated radar in Slough, England, UK.
Napoleon Bonaparte escaped from Elba.
The New York Philharmonic Orchestra performed in Pyongyang, North Korea.
£1 notes were circulated in Britain.
