- Mary FitzMaurice, 4th Countess of Orkney
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Mary FitzMaurice, 4th Countess of Orkney (4 September 1755 – 30 December 1831) was a Scottish suo jure peeress, the only surviving child of Murrough O'Brien, 1st Marquess of Thomond and Mary O'Brien, 3rd Countess of Orkney.
Born Mary O'Brien, she was married to the Hon. Thomas FitzMaurice, younger brother of the 1st Marquess of Lansdowne, on 21 December 1777. Their son, born in 1778, was John FitzMaurice, Viscount Kirkwall (who was the father of the 5th Earl of Orkney, Thomas John Hamilton FitzMaurice). She succeeded her mother 10 May 1791. Her husband died in 1793.
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Peerage of Scotland Preceded by
Mary O'BrienCountess of Orkney
1791-1831Succeeded by
Thomas FitzMauriceCategories:- 1755 births
- 1831 deaths
- People associated with Orkney
- Hereditary suo jure peeresses
- Scottish countesses
- Petty-Fitzmaurice family
- Orkney stubs
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