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Mary O'Brien, 3rd Countess of Orkney (c. 1721 – 1790) 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.
27 de abr. de 2022 · Genealogy for Mary O'Brien, 3rd Countess of Orkney (c.1721 - 1790) family tree on Geni, with over 250 million profiles of ancestors and living relatives.
- May 10, 1790
Mary died at Rostellan Castle in May 1790. Some accounts say she was buried at Cloyne Cathedral in County Cork others at Taplow in Buckinghamshire. My research continues. So what is the connection between Mary O’Brien, 3rd Countess of Orkney and the St John family at Lydiard Park.
On 29 March 1720, he married his cousin, Lady Anne Hamilton, the eldest daughter and heiress of George Hamilton, 1st Earl of Orkney, and his wife Elizabeth (née Villiers). His wife became 2nd Countess of Orkney in her own right in 1737. They had five children: Lady Mary (c.1721–1791), later 3rd Countess of Orkney
Mary O'Brien, 3rd Countess of Orkney (c. 1721 – 1790) 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.
Is this your ancestor? Explore genealogy for Mary O'Brien born 1733 died 1790 Rostellan Castle, County Cork, Ireland including ancestors + descendants + 1 genealogist comments + more in the free family tree community.
18 de abr. de 2024 · Mary (née O'Brien), Countess of Orkney (1755-1831), Daughter of 1st Marquess of Thomond and 3rd Countess of Orkney. Sitter in 2 portraits
