Who was Mary-Ann O'Brien?

Mary-Ann O'Brien (1794–1795) was born in Norfolk Island and died in Norfolk Island. 2 researchers on YourRoots have this ancestor in their family trees.

How many people are researching Mary-Ann?

Right now, 2 researchers on YourRoots have Mary-Ann in their trees. The ancestor migration map traces 2 generations of this lineage.

What records do they have for Mary-Ann?

Records vary by researcher and can include census, vital, parish, cemetery, and family sources.

How do I compare family trees?

Use Compare Tree on an available researcher profile to compare overlapping people and records.

Mary-Ann O'Brien 1794–1795

Public Tree Person

What is a Public Tree Person?

A Public Tree Person is an ancestor documented independently by multiple YourRoots tree owners. When several researchers' family histories converge on the same person, we publish a shared page that combines what they've documented.

Why this is a Public Tree Person

Full name consistent across 2 independent trees

Birth year and location consistent across 2 trees

Death year and location consistent across 2 trees

Compare a Public Tree Person with your own tree using Compare Tree.

B Reliability

Reliability Score: B

Medium — based on the source tree

Grade scale

A 3 criteria (Strong)
B 2 criteria (Medium)
C 1 criteria (Basic)

Verification checklist

Record available
Descendant's record available
Star tree owner

2 researchers on YourRoots have Mary-Ann O'Brien in their family trees — each with their own records and documentation. Trace the migration path across 2 generations. If this ancestor is in your tree too, you can compare what you've found and fill in the gaps together.

Last updated: August 25, 2026 · Reliability: B — verified across 2 independent trees

Born 26 Feb 1794 · Norfolk Island

Died 21 Feb 1795 · Norfolk Island

Father Thomas O Brien 1St Fleet

Mother Susannah Mortimer 2Nd Fleet

Siblings Agnes Therese O Brien, Catherine O Brien, Elizabeth O Brien, James O Brien, Margaret O Brien, Mary Ann O Brien, William Wallace O Brien

Compare Tree

Researchers connected through Mary-Ann O'Brien 1794–1795

and 1 more tree owner connected with Mary-Ann O'Brien 1794–1795

Immediate Family

Parents

Thomas O Brien 1St Fleet

Susannah Mortimer 2Nd Fleet

Spouse(s)

No spouse recorded

Children

No children recorded

Biography

The story of Mary-Ann O'Brien began in 1794 in Norfolk Island. Mary-Ann O'Brien passed away in 1795 in Norfolk Island.

Sources

Life Timeline

1794

Birth of Mary-Ann O'Brien in Norfolk Island

Birth

1795

Death of Mary-Ann O'Brien in Norfolk Island

Death

Oldest Ancestor Line from Mary-Ann O'Brien

This ancestor line traces from Sandford, Devonshire, England (1719) to Bridford, Devon, England (1762) across 2 generations.

Direct Lineage

generations

Frequently Asked Questions

: Mary-Ann O'Brien (1794–1795) was born in Norfolk Island and died in Norfolk Island. 2 researchers on YourRoots have this ancestor in their family trees, each with their own records. This page combines what they've independently documented and assigns a Reliability Score (B) based on cross-tree validation.
: Right now, 2 researchers on YourRoots have Mary-Ann in their trees. They're working independently, so connecting with them is a good way to cross-check your records and find things you might have missed. You can also explore the ancestor migration map that traces 2 generations of this lineage geographically.
: It varies by researcher — some have census records, others have marriage certificates, parish registers, or family Bible entries. Scroll up to see exactly what each person has cited.
: Use the "Compare Tree" button on any researcher's profile above. You can compare your tree side by side with theirs, see where your records overlap or differ, and collaborate to fill gaps.

Related Records

Thomas O Brien 1St Fleet

Father

Susannah Mortimer 2Nd Fleet

Mother

Mary-Ann O'Brien's Ancestors

Pedigree chart — 3 generations on record

Self

Mary-Ann O'Brien PTP

1794–1795

Norfolk Island