About Mary O'Brien, 3rd Countess of Orkney

Mary O'Brien, 3rd Countess of Orkney was the eldest daughter of Anne O'Brien, 2nd Countess of Orkney, and William O'Brien, 4th Earl of Inchiquin, and Countess of Orkney in her own right.

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Occupation: politician
Born: 1721
Died: May 10, 1791

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Facts from Wikidata (CC0).

Mary O'Brien, 3rd Countess of Orkney

Scottish noble

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