432: Saint Patrick, aged about 16, is captured by Irish pirates from his home in Great Britain and taken as a slave to Ireland (traditional date)

1861: Italy is unified into a single kingdom under Victor Emmanuel II following the campaigns led by Giuseppe Garibaldi

1905: Albert Einstein finishes his scientific paper detailing his quantum theory of light, a foundation of modern physics

1939: Battle of Nanchang between the Kuomintang and the Japanese breaks out during the Second Sino-Japanese War (1937-1945)

1942: Bełżec Concentration Camp opens with the transport of 30,000 Polish Jews from Lublin

Source: Onthisday.com