My earlist Manley is Robert MANLEY married Joane CAWLEY in Kilmington in 1747. They resided in Kilmington and then Axminster after c1751. Joane was born abt 1724, no idea abt Robert.
There are a few baptisms in Axminster of Ann daughter of Robert MANLEY in 1704 and 1706. I dont know if my Robert MANLEY is the youngest son of this guy.
There doesnt seem to be any MANLEYS prior to this in Axminster or Kilmington.