Margaret (of Thormond) O'brien
- Yes, date unknown
1. Margaret (of Thormond) O'brien (daughter of Donnchadh\Donogh (4th Earl of Thomond) O'brien and Helen Or Amy (of Fermoy) Roche); and died. Margaret married Cormac Og (1st Viscount Muskerry) Maccarthy about 1590. Cormac (son of Cormac Macdermott (of Muskerry) Maccarthy and Margaret (of Caher) Butler) died in May 1640; was buried on 27 May 1640. [Group Sheet] [Family Chart]
Children:- Donough (1st Earl of Clancarty) Maccarthy was born in 1594; died on 4 Aug 1665.
- Cecilia Or Gille (of Muskerry) McCarthy and died.
2. Donnchadh\Donogh (4th Earl of Thomond) O'brien (son of Conchobhat (3rd Earl of Thomond) O'brien and Una O'brien); died on 5 Sep 1624. Donnchadh\Donogh + Helen Or Amy (of Fermoy) Roche. Helen (daughter of Maurice (6th Viscount Fermoy) Roche and Eleanor Fitzgerald) and died. [Group Sheet] [Family Chart]
3. Helen Or Amy (of Fermoy) Roche (daughter of Maurice (6th Viscount Fermoy) Roche and Eleanor Fitzgerald); and died. Children:
- 1. Margaret (of Thormond) O'brien and died.
Generation: 3
4. Conchobhat (3rd Earl of Thomond) O'brien was born about 1535 (son of Donoch (2nd Earl of Thomond) O'brien and Helen (of Ormond) Butler); died in Jan 1580-1581. Conchobhat + Una O'brien. Una (daughter of Turlogh O'brien) died in 1589. [Group Sheet] [Family Chart]
5. Una O'brien (daughter of Turlogh O'brien); died in 1589. Children:
- 2. Donnchadh\Donogh (4th Earl of Thomond) O'brien died on 5 Sep 1624.
- Domhnall (1st Viscount Clare) O'brien was born in 1577; died in 1663.
- Honor (of Thormond) O'brien died in 1600.
6. Maurice (6th Viscount Fermoy) Roche (son of David (5th Lord Fermoy) Roche and Ellen (of Dunboyne) Butler); died on 24 Oct 1600. Maurice married Eleanor Fitzgerald before 1566. Eleanor (daughter of Maurice Fitzjohn Fitzgerald and Julia O'mulryan) died after 27 May 1590. [Group Sheet] [Family Chart]
7. Eleanor Fitzgerald (daughter of Maurice Fitzjohn Fitzgerald and Julia O'mulryan); died after 27 May 1590. Children:
- David (7th Viscount Fermoy) Roche was born before 1588; died on 22 Mar 1635.
- 3. Helen Or Amy (of Fermoy) Roche and died.
Generation: 4
8. Donoch (2nd Earl of Thomond) O'brien (son of Murrough (1st Earl of Thomond ) King of Thomond and Annabella (of Clanricarde) De Burg); died on 1 Apr 1553. Donoch married Helen (of Ormond) Butler about 1533. Helen (daughter of Piers (8th Earl of Ormonde) Butler and Margaret (of Kildare) Fitzgerald) died on 2 Jul 1597. [Group Sheet] [Family Chart]
9. Helen (of Ormond) Butler (daughter of Piers (8th Earl of Ormonde) Butler and Margaret (of Kildare) Fitzgerald); died on 2 Jul 1597. Children:
- 4. Conchobhat (3rd Earl of Thomond) O'brien was born about 1535; died in Jan 1580-1581.
- Margaret (of Thomond) O'brien and died.
10. Turlogh O'brien and died. Children:
- 5. Una O'brien died in 1589.
12. David (5th Lord Fermoy) Roche (son of Maurice (4th Lord Fermoy) Roche and Grany (of Muskerry) Mac-Carty); died between 1581 and 1582. David + Ellen (of Dunboyne) Butler. Ellen (daughter of James (Lord Dunboyne) Butler and Joan (of Dunboyne) Butler) and died. [Group Sheet] [Family Chart]
13. Ellen (of Dunboyne) Butler (daughter of James (Lord Dunboyne) Butler and Joan (of Dunboyne) Butler); and died. Children:
- Jane (of Fermoy) Roche and died.
- 6. Maurice (6th Viscount Fermoy) Roche died on 24 Oct 1600.
- Ellen (Roche of Fermoy) Roche died after 1599.
14. Maurice Fitzjohn Fitzgerald (son of John (13Th Earl of Desmond) Fitzgerald and Maud O'brien); and died. Maurice + Julia O'mulryan. Julia and died. [Group Sheet] [Family Chart]
15. Julia O'mulryan and died. Children:
- 7. Eleanor Fitzgerald died after 27 May 1590.