Any royal lines for Philippa (Prest) Leigh, mother of Lucretia (Leigh) Bonython?

The _Great Migration_ sketch of Richard Bonython of Maine shows that
he married "[b]y about 1607 Lucretia Leigh, daughter of William and
Phillippa (Prest) Leigh of St Thomas by Launceston, Cornwall" ...

http://books.google.com/books?id=ZcEMAAAAYAAJ&dq=leigh+prest+launceston&q=leigh+prest+launceston&pgis=1#search

The mother of Lucretia is presumably the "Phillip" wife of Wm. Leigh
and Digory Greenvile in this contemporary pedigree:

http://books.google.com/books?id=fqwKAAAAYAAJ&pg=PA226&dq=leigh+prest+launceston

Ancestral names would seem to include Wood and Dr[e]we.
.