April 9, 1413 - Henry V is crowned King of England. His eventually married Princess Catherine of France to help solidify his claim to the Crown of France.
April 9, 1483 - Edward V, eldest son of Edward IV, became king upon his father's untimely death. He was never crowned, though. Edward and his younger brother Richard, Duke of York, disappeared from the Tower a couple of months later and their fate remains a mystery to this day and a hot topic of debate. Some believe their uncle Richard III had them killed, others think he spirited them off somewhere, while others believe Henry VII killed the boys.