- 1204 4th Crusade occupies & plunders Constantinople
- 1811 1st US colonists on Pacific coast arrive at Cape Disappointment (Washington)
- 1927 Kuomintang leader Chiang Kai-shek begins counter revolution in Shanghai
- 1961 Russian cosmonaut Yuri Gagarin becomes the first person to orbit Earth (Vostok 1)
- 1980 US Olympic Committee endorses a boycott of the Moscow Olympic games
Sir Frank Whittle ground-tests the first jet engine designed to power an aircraft at Rugby, England.
On April 12, 1937