High Quality Content by WIKIPEDIA articles! David Michael Mountbatten, 3rd Marquess of Milford Haven (12 May 1919 – 14 April 1970), styled Viscount Alderney before 1921 and Earl of Medina between 1921 and 1938, was the son of the 2nd Marquess of Milford Haven and Countess Nadejda de Torby.