I also have Sarah Bwye on my tree, born 1778 in Olveston, baptised 5th Apr 1778, daughter of John Bwye (my 4th great grandfather, 1751-1834) and Elizabeth Moreton (1756-1783); married John Griffiths 7 May 1804 in Henbury. I've got stuck in the Bwye line at her grandfather William (b. 1725 in Alveston) and can't get any further back. Any help?
Best wishes,
Xanthe