324: Battle of Adrianople: Roman Emperor Constantine I defeats his co-emperor Licinius, who flees to Byzantium

1863: Battle of Gettysburg, the largest battle ever fought on the American continent, ends in a major victory for the Union during the US Civil War

1884: Dow Jones publishes its first stock index, the Dow Jones Transportation Average

1996: UK House of Commons announces that the Stone of Scone, aka the Stone of Destiny, used in the coronation of Scottish and subsequently English and British monarchs, will be returned to Scotland after 700 years in Westminster Abbey

Source: Onthisday.com