Do you have a John Jelfe in your tree who was a master gunner, later promoted to Captain, in the English navy during the English Civil War period? There are numerous mentions of him in histories of the period but I have not been able to confirm which line he is in or dates of birth/death. It was reported that he served on the 'Happy Entrance' and, during the struggle for control of the Channel Islands, was arrested for piracy. He is reported to have been from Stroud, Gloucestershire.