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Mary FitzMaurice, 4th Countess of Orkney was a Scottish peer, the only surviving child of Murrough O'Brien, 1st Marquess of Thomond and Mary O'Brien, 3rd Countess of Orkney.
Mary FitzMaurice, 4th Countess of Orkney across IJR
Mary FitzMaurice, 4th Countess of Orkney was a Scottish peer, the only surviving child of Murrough O'Brien, 1st Marquess of Thomond and Mary O'Brien, 3rd Countess of Orkney.
