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Lady Mary O'Brien

Mary's father was Henry O'Brien and her mother was Mary Brereton. Her maternal grandparents were Lord William Brereton and Margaret Savage. She had four sisters named Margaret, Anne, Honora and Elizabeth. She died in 1686.

General Notes
- Lady Mary O'Brien married (24 June 1627) Charles Cokayne, 1st Viscount Cullen.

Ancestor Pedigree Chart
- Henry O'Brien
  - b.~  1588 d.22 Apr 1639
  
  Lady Mary O'Brien
  - d.1686
  
  Sir William Brereton III ^*
  - b.~  1473 in Brereton cum Smethwick d.14 Feb 1541 in Kilkenny
  
  Sir William Brereton
  - b.~  1500 d.1534
  
  Alice Savage
  
  Sir William Brereton MP
  - b.1521 in Sandbach d.04 Sep 1559
  
  Anne Booth
  
  Lord William Brereton
  - b.06 Feb 1550 in Brereton cum Smethwick d.01 Oct 1631 in Cheshire
  
  Jane Warburton
  - b.~  1525 d.>  1550
  
  Mary Brereton
  - b.28 Dec 1580 in Brereton cum Smethwick d.Apr 1640
  
  Margaret Savage
  - b.1549 in Clifton d.07 Apr 1597 in Brereton cum Smethwick
  
  ^*There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)