February 18, 1478 - George, Duke of Clarence, charged with treason against his brother Edward IV, was (supposedly) drowned in a butt of Malmsey wine at the Tower of London. According to legend, he was given the choice of how he wanted to die and this was what he chose.
February 18, 1504 - Henry Tudor, the future King Henry VIII, was invested as Prince of Wales at age 12 after the death of his older brother Prince Arthur.
February 18, 1517 - Mary Tudor, the future Mary I, was born to Henry VIII and Catherine of Aragon. She would be their only surviving child.