Archibald Frederick Campbell, Marquess of Lorne (born 9 March 2004) is the elder son and Heir Apparent of the 13th Duke of Argyll. March 9 is the 68th day of the year in the Gregorian Calendar (69th in Leap years). ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... Contrasting with heir presumptive, an heir apparent is one who cannot be prevented from inheriting by the birth of any other person. ... Torquhil Ian Campbell, 13th Duke of Argyll (born 29 May 1968) is a Scottish peer; he is also the 6th Duke of Argyll in the Peerage of the United Kingdom. ...