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.
From *.wikipedia.org,
General Info
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Female
Date of Birth
January 1st, 1721
Age
304
Date of Death
May 10th, 1791
Died Aged
70
Star Sign
Capricorn
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Relatives
Anne O'Brien, 2nd Countess of Orkney
Mother
William O'Brien, 4th Earl of Inchiquin
Father
Murrough O'Brien, 1st Marquess of Thomond
Husband
Mary FitzMaurice, 4th Countess of Orkney
Daughter
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