according to Wikipedia:
1215 - King John of England puts his seal to the Magna Carta.
1219 - Dannebrog - oldest national flag in the world - and flag of Denmark. According to legend, fell from the sky during the Battle of Lyndanisse (now Tallinn) in Estonia, and turned the Danes' luck.
1330 - Edward the Black Prince, Prince of Wales born (d. 1376)
1381 - Wat Tyler, English rebel dies
1775 - American Revolutionary War: George Washington is appointed commander-in-chief of the Continental Army.
1808 - Joseph Bonaparte appointed King of Spain by the French dictator Napoleon.
1844 - Charles Goodyear receives a patent for vulcanization, a process to strengthen rubber.
1888 - Prince Wilhelm II becomes Kaiser Wilhelm II and is the last emperor of the second reich
1911 - Tabulating Computing Recording Corporation (IBM) is incorporated.
1976 - Jimmy Dykes, baseball player and manager dies (b. 1896)
1996 - In Manchester, UK, a terrorist bomb injures over 200 people and devastates a large part of the city centre.