There are 2 titles associated with this person.

@book{ wphp_22019
  author={Gray,Margaret Blair},
  year={1747},
  title={Information for the magistrates of Perth, pursuers; against my Lady Gray, and her husband Lord Gray, defenders.},
  publisher={},
  address={Edinburgh},    }
@book{ wphp_23104
  author={Gray,Margaret Blair and Gray,John},
  year={1748},
  title={Objections or defences for His Majesty's advocate, on behalf of the Crown; to the claim of Margaret Lady Gray, and John Lord Gray her husband.},
  publisher={s.n. [sine nomine]},
  address={Edinburgh},    }