Mary FitzMaurice, 4th Countess of Orkney, Date of Birth, Date of Death
TweetMary FitzMaurice, 4th Countess of Orkney
British noble
Date of Birth: 
About Mary FitzMaurice, 4th Countess of Orkney
- Mary FitzMaurice, 4th Countess of Orkney (4 September 1755 – 30 December 1831) was a Scottish peer, 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 on 10 May 1791.
- Her husband died in 1793 with the Countess retaining possession of Cliveden, the family seat of the Earls of Orkney, now owned by the National Trust.
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