On Fri, 26 Sep 2008 10:20:52 -0700, Kay Robinson <[email protected]> wrote: >[...] Can you tell me when "Niall of the Nine Hostages" >subjected himself to DNA testing? I always thought that DNA wasn't >discovered until the mid 20th century and that DNA mapping is an even >more modern discovery.[...] Google is your friend. See http://www.familytreedna.com/matchnialltest.html for account of why they think certain markers indicate descent from Niall. The page lists the markers.