March 5: Lei Feng Day in the People’s Republic of China; St Piran’s Day in Cornwall (United Kingdom)
- 1496 – King Henry VII of England issued letters patent to John Cabot and his sons, authorising them to explore unknown lands.
- 1940 – World War II: Soviet leader Joseph Stalin and the Politburo signed an order for the execution of about 22,000 Polish military officers, policemen, intellectuals and civilian prisoners of war that were captured during the Soviet invasion of Poland.
- 1960 – Cuban photographer Alberto Korda took his iconic photograph of Marxist revolutionary Che Guevara (pictured).
- 1981 – The ZX81, a pioneering British home computer, was launched by Sinclair Research and went on to sell over 1.5 million units around the world.
- 1999 – Paul Okalik was elected as the first Premier of the Canadian territory of Nunavut.