I have children as Elizabeth (1675-1759), Warren (1680- ) and Jacob (or Jacobi or Jacobus) (1677-1715).

Jacob married Elizabeth Jones (1680-1740) in 1698. Their children were Jacobus (1697-1779), James (1696-1779), Philip (1700-1746), Margaret (1704- ) and Maria (1705-1735).

Jacobus married Sarah (1700-1741) and their son was Richard (1728-1767) who married Sarah (1730-1801). They had 16 children.

I can find no information further back than Richard, hence the question.

These seem to belong to a Richard / Mary union not a Richard/Maria union

1673 JAMES Richard Richard Mary St Briavels
1677 JAMES James Richard Mary St Briavels
1680 JAMES Warren Richard Mary St Briavels