Foster: Preston, William, s. William, of Ashton, Devon, cler. Exeter Coll., matric. 16 Mar 1686-7, aged 16; BA 1690, fellow 1692-5, MA 1694; perhaps rector of Barwick, Somerset, 1703. See Foster's Index Eccl.; Boase, 84.
The R of Barwick is ID 47884.