October 4: Cinnamon Roll Day in Sweden and Finland
Seal of Otto IV
- 1209 – Otto IV, Holy Roman Emperor (seal pictured), was crowned.
- 1363 – Red Turban Rebellions: The rebel leader Zhu Yuanzhang won the Battle of Lake Poyang by deploying ships intentionally set aflame when the emperor tried to escape.
- 1918 – An ammunition plant in Sayreville, New Jersey, U.S., exploded, killing around 100 people and destroying more than 300 buildings.
- 1957 – The Soviet spacecraft Sputnik 1, the first artificial satellite to orbit the Earth, was launched from the Baikonur Cosmodrome.
- 2003 – A suicide bomber killed 21 people, including a two-month-old baby, and injured 60 others inside a restaurant in Haifa, Israel.
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