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Byzantine emperor. The Byzantine, East Roman, Empire was in a state of collapse when Heraclius became emperor in 610. He built up the military and in six years defeated many of his enemies, including the Persians, who had almost captured Byzantine. In the 630s his luck ran out and he was unable to stop new…

1800 – Dr Benjamin Waterhouse gives the first cowpox vaccination in the US to his son to prevent smallpox. More at: History