306: Constantine I is proclaimed Roman Emperor by his troops

1814: English engineer George Stephenson introduces his first steam locomotive, a travelling engine designed for hauling coal on the Killingworth wagonway named Blücher

1943: Benito Mussolini dismissed as Italian Premier and arrested on the authority of King Victor Emmanuel III

1944: World War II: Operation Spring – one of Canada’s bloodiest days, 18,444 casualties and 5,021 killed

1997: Scientists announce the first human stem cells to be cultured in a laboratory using tissue taken from aborted human embryos

Source: Οnthisday.com