Mary FitzMaurice, 4th Countess of Orkney

British noble (1755-1831) (1755–1831)

Parents

• Mary O'Brien, 3rd Countess of Orkney
• Murrough O'Brien, 1st Marquess of Thomond

Children

• John FitzMaurice, Viscount Kirkwall

Partners

• Thomas FitzMaurice