Hi - Hope this is of some help.
http://en.wikipedia.org/wiki/Owain_Glynd%C5%B5r(Owen Glendower)
http://genuki.cs.ncl.ac.uk/DEV/Huguenots.html(inc Exeter, near Dawlish)
http://genuki.cs.ncl.ac.uk/DEV/Dawlish/The website below... mentions an immigrant ship, 'Owen Glendower', bound for Melbourne, Australia. Perhaps your ancestor was a sailor on board this ship, or on another of its voyages. His future wife could have met him in Plymouth when it called in.
http://news.google.com/newspapers?nid=1301&dat=18600112&...http://genuki.cs.ncl.ac.uk/DEV/Plymouth/index.htmlGood luck. Sue