1099: Godfrey of Bouillon is elected the first Defender of the Holy Sepulchre of the Kingdom of Jerusalem during the First Crusade

1456: Hungarian army under John Hunyadi defeats the forces of Ottoman Sultan Mehmed II and ends the Siege of Belgrade (Nándorfehérvár), halting Ottoman expansion in Europe for 70 years

1515: First Congress of Vienna settles issues between Poland and the Holy Roman Empire, demonstrating the Habsburgs’ growing influence

1942: 300,000 Jews from the Warsaw Ghetto are sent to Treblinka Extermination Camp

1963: Sarawak achieves independence from British colonial rule

2011: Norway is the victim of twin terror attacks, a bomb blast targeting government buildings in central Oslo and a massacre at a youth camp on the island of Utøya

Source: Onthisday.com