YourRoots Logo
Sign up free
banner

Sign up to explore more

Create a free account to navigate family trees, view ancestors, and discover connections.

Sign up free

Margaret (Sarah) O'Brien 1542 – 1585 – Genealogical Records

Birth Date: 1542

Birth Location: Bunratty Castle, Thomond, Clare, Ireland

Death Date: 1585

Death Location: Madrid, Madrid, Madrid, Espagne

Father: Sir OBrien

Mother: Slaney O'Brien

Spouse(s): Donal Beare

Children(s): Donal O'Sullivan

The story of Margaret (Sarah) O'Brien Lady Of Thomond began in 1542 in Bunratty Castle, Thomond, Clare, Ireland. Margaret (Sarah) O'Brien Lady Of Thomond married Donal O'Sullivan Beare, and had children including Donal Daniel Cam O'Sullivan. Margaret (Sarah) O'Brien Lady Of Thomond passed away in 1585 in Madrid, Madrid, Madrid, Espagne.

Find more search results for Margaret O'Brien
MO

Reliability Score

This score reflects the reliability of the source family tree. A high rating indicates a trustworthy source with strong data consistency.

Reliability Score:
C
Criteria:
  • A 3 criteria (Strong)
  • B 2 criteria (Medium)
  • C 1 criteria (Basic)
  • N/A 0 criteria (Insufficient)

This tree's reliability score:

  • Record available
  • Descendant's record available
  • Star tree owner

Biography

  • The story of Margaret (Sarah) O'Brien Lady Of Thomond began in 1542 in Bunratty Castle, Thomond, Clare, Ireland.
  • Margaret (Sarah) O'Brien Lady Of Thomond married Donal O'Sullivan Beare, and had children including Donal Daniel Cam O'Sullivan.
  • Margaret (Sarah) O'Brien Lady Of Thomond passed away in 1585 in Madrid, Madrid, Madrid, Espagne.

Immediate Family

Parents

Spouses(s)

Children(s)

Margaret O'Brien's Ancestors

Self
Margaret O'Brien
1542 – 1585
Birth Place: Bunratty Castle, Thomond, Clare, Ireland
Parents
Sir Daniel Inistimon OBrien
1522 – 1579
Thomond, Clare, Munster, Ireland
Slaney (Carrach) O'Brien
1522 – 1577
Clare, Armagh, Northern Ireland
Grandparents
Murchadh (King) Thomand
1497 – 1551
Inchiquin, Thomond, North Munster, Ireland
Great-Grandparents
Prince Thomond
1475 – 1539
2nd-Great-Grandparents

Margaret O'Brien's Descendants

1.
MO
Margaret ((Sarah)) O'Brien (1542 – 1585) m. Donal (O'Sullivan) Beare (1535 – 1563)
  1. 1. Donal (Daniel Cam) O'Sullivan (1 Jan 1561 – 16 July 1618) m. Elana ((Ellen)) MacAuliffe (1 January 1567 – 16 July 1613)
    1. 1. Dermot (O'SULLIVAN^) Bere (1601 – 1659) m. Marianna Cordona (1600 – Abt. 1659)
      1. 1. John O'Sullivan (1640 – 1703) m. Countess (Antonia O'Sullivan) Bere (1649 – 1718)
        1. 1. John O'Sullivan (1683 – 1746) m. Elizabeth Youde (1687 – 1761)

Margaret O'Brien's Timeline

3 Records

1542
1542
Birth of Margaret (Sarah) O'Brien Lady Of Thomond in Bunratty Castle, Thomond, Clare, Ireland
Bunratty Castle, Thomond, Clare, Ireland
1560
Abt. 1560
Age 18
Margaret (Sarah) O'Brien Lady Of Thomond was married in Bearhaven, Kerry, Munster, Ireland
Bearhaven, Kerry, Munster, Ireland
1585
1585
Age 43
Death of Margaret (Sarah) O'Brien Lady Of Thomond in Madrid, Madrid, Madrid, Espagne
Madrid, Madrid, Madrid, Espagne

Sources

    Genealogy Event 1
    Event Type: Birth
    Event Date: 1542
    Event Place: Bunratty Castle, Thomond, Clare, Ireland

    Genealogy Event 2
    Event Type: Marriage
    Event Date: Abt. 1560
    Event Place: Bearhaven, Kerry, Munster, Ireland

    Genealogy Event 3
    Event Type: Death
    Event Date: 1585
    Event Place: Madrid, Madrid, Madrid, Espagne

About YourRoots

Family Tree Map

Explore your family tree geographically

Import your GEDCOM file to transform your family tree into an interactive global map. See your roots laid out visually and understand your true geographic heritage.

Powerful tools like “Trace Back To Me” instantly map your family’s migration paths from a chosen ancestor all the way back to you.

LEARN MORE
AI Genealogy Research

Discover ancestors beyond “end-of-line” automatically

Import your family tree and let AI expand it for you. AI Ancestor Finder scans “end-of-line” ancestors to uncover their parents across hundreds of family lines at once. AI Deep Research analyzes selected ancestors and family clusters, suggesting relevant records and next steps.

Turn on Auto Research Mode to get new discoveries daily or weekly, so your tree keeps growing even while you’re away.

LEARN MORE
DNA Match

Find more DNA matches across all DNA tests

Combine your DNA data with your family tree to unlock the full power of YourRoots DNA Match. Connect with relatives across major testing services — Ancestry, 23andMe, MyHeritage, and more.

View your matches’ maps and trees to identify shared ancestors, and soon you’ll be able to add them directly to your own tree and map.

LEARN MORE
Ancestry Reports

Ancestry DNA analysis that goes deeper than others

Unlock exclusive reports that reveal your deeper origins.

  • Deep Ancestry Report — Analyze 130+ ethnicities, sub-regions, and 1,800+ communities in one detailed view.
  • Global & Native American Reports — Developed with Stanford researchers to uncover hidden ancestries across all 22 chromosomes.
  • Ancient DNA Series — Compare your DNA with 1,000+ ancient genomes from Viking, Celtic, and early American civilizations.
LEARN MORE