Mary O'FitzMaurice, countess of Orkney [née O'Brien] (1755-1831)
The daughter of Murrough O'Brien, 1st Marquess of Thomond; in 1777 she married Thomas
FitzMaurice (1743-93), son of John Petty, first Earl of Shelburne.
The daughter of Murrough O'Brien, 1st Marquess of Thomond; in 1777 she married Thomas
FitzMaurice (1743-93), son of John Petty, first Earl of Shelburne.