April 30, 313 – Roman emperor Licinius unified the entire Eastern Roman Empire under his rule. 1006 Supernova Sighted. Scholars believe that a supernova, the brightest ever known to have been seen, was observed in Europe, China, Japan, and Egypt. The explosion of Supernova 1006 occurred near the star Beta Lupi, on the border to Centaurus in the constellation Lupus. Supernovae are exploding stars that may give off a luminosity 100 million times that of the sun. 1513 Edmund de la Pole, Yorkist pretender to the English throne, was executed on the orders of Henry VIII.
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