In 1502, Henry VII's first son and heir-apparent, Arthur, Prince of Wales, died suddenly at Ludlow Castle, very likely from a viral respiratory illness known, at the time, as the "English sweating sickness". This made Henry, Duke of York (Henry VIII) heir-apparent to the throne. The King, normally a reserved man who rarely showed much emotion in public unless angry, surprised his courtiers by his intense grief and sobbing at his son's death, while his concern for the Queen is evidence that the marriage was a happy one, as is his reaction to the Queen's death the following year, when he shut himself away for several days, refusing to speak to anyone.