On April 9... look at another day
April 9: Vimy Ridge Day in Canada (1917); Day of Valor in the Philippines (1942)
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National Gallery
- 193 – Year of the Five Emperors: Septimius Severus was proclaimed Roman emperor by his troops at Carnuntum in modern-day Austria.
- 1388 – Despite being vastly outnumbered, forces of the Old Swiss Confederacy defeated an Austrian army at the Battle of Näfels.
- 1838 – The National Gallery (pictured) opened in its current building in Trafalgar Square, London.
- 1939 – After being denied permission to perform at Constitution Hall by the Daughters of the American Revolution, African-American singer Marian Anderson gave an open-air concert on the steps of the Lincoln Memorial in Washington, D.C.
- al-Muqtafi (b. 1096)
- Isambard Kingdom Brunel (b. 1806)
- Mary Jackson (b. 1921)