Is this him?? Baptism: 9 April 1758 Welsh St Donats: Lewis David, parents: Richard & Ann. Glamorgan Baptism Index CD.
Oct 1790 Will of Mary Leyson (written May 1787): mentions that Jane Bassett should pay her sister, Mary £5 if she married Lewis David, son of Richard David of Prisk. (PM-639)
1787 Marriage Record says he was from Welsh St Donats parish. (PM-209)