George Plantagenet, the 1st Duke of Clarence and brother to King Edward IV, is executed for high treason on February 18, 1478, at the Tower of London during the War of the Roses. The execution was the culmination of years of political rivalry, shifting alliances, and acts of disloyalty by the Duke against his brother, the King.
His execution took place following his conviction by Parliament, he was killed privately, with popular legend, immortalized by Shakespeare, claiming he was drowned in a butt of Malmsey wine.