- 1250 The Seventh Crusade is defeated in Egypt, Louis IX of France is captured.
- 1598 Edict of Nantes grants political rights to French Huguenots
- 1742 George Frideric Handel's oratorio "Messiah" performed for the 1st time at New Music Hall in Dublin
- 1860 1st Pony Express reaches Sacramento, California
- 1868 Abyssinian War ends as British and Indian troops capture Magdala and Ethiopian Emperor commits suicide
Apollo 13 announces "Houston, we've got a problem!" as Beech-built oxygen tank explodes en route to Moon
On April 13, 1970