William O'Brien 
William was born about 1640. William's father was Murchadh O'Brien and his mother was Elizabeth Saint Leger. His paternal grandfather was Diarmaid O'Brien and his paternal grandmother is Ellen Fitzgerald. He had a sister named Mary. He was the older of the two children. He died in January 1691 in St. Lago de la Vega, Jamaica (Died of Plague). He was buried in St. Lago de la Vega, Jamaica.General Notes
SOURCES: "Ancestors of Mathilde de Saint Valery", http://www.geneastar.org.
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Ancestor Pedigree Chart
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*There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)
- b.~ 1525 d.31 Jan 1557
- b.1550 d.20 Apr 1573
- b.~ 1532 d.1585
- b.~ 1572 d.29 Jul 1597 in Ireland
- b.~ 1552
- b.1594 in Hillsborough, Ireland d.29 Dec 1624
- b.~ 1534 d.Nov 1559
- b.~ 1554
- b.~ 1534
- b.~ 1575 in Castletown Delvin, Westmeath, Ireland d.>Jan 1609
- b.25 Feb 1525 in London, Middlesex, England d.16 Nov 1585 in London, Middlesex, England
- b.~ 1555 d.~01 Oct 1610 in Castletown Delvin, Westmeath, Ireland
- b.~ 1528 in Kildare, Ireland d.25 Aug 1610 in Kildare, Ireland
- b.~ 1615 d.09 Sep 1674
- b.1597
- b.~ 1640 d.Jan 1691 in St. Lago de la Vega, Jamaica (Died of Plague)
- b.~ 1620 d.22 May 1685
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Children
William O'Brien
William was born in 1666. He died at the age of 53 on December 24th, 1719 in Cloyne Cathedral.