Prior to Now family trees centre
O'Brien, Murrough 1st Marquess of Thomond
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- 1 O'Brien, Murrough 1st Marquess of Thomond [1] b. Abt 1726 d. 10 Feb 1808
O'Brien, Mary 3rd Countess of Orkney (suo jure) Marchioness of Thomond b. Abt 1721 d. 10 May 1791
- 2 O'Brien, Mary [1.1]
b. 4 Sep 1755 d. 30 Dec 1831
FitzMaurice, Hon Thomas b. Abt 1742 d. 28 Oct 1793
- 3 FitzMaurice, John Hamilton Viscount Kirkwall [1.1.1]
b. 9 Oct 1778 d. 23 Nov 1820
- + de Blaquière, Hon Anna Maria Viscountess Kirkwall d. 31 Jan 1843
- + de Blaquière, Hon Anna Maria Viscountess Kirkwall d. 31 Jan 1843
- 3 FitzMaurice, John Hamilton Viscount Kirkwall [1.1.1]
- 2 O'Brien, Mary [1.1]
- + Palmer, Mary Marchioness of Thomond b. Abt 1750 d. Abt 1820