Home › Entities › human › Mary O'Brien, 3rd Countess of Orkney

Mary O'Brien, 3rd Countess of Orkney

Scottish noble
Person human Q6780433
Press Enter · cited answer in seconds

Mary O'Brien, 3rd Countess of Orkney

Summary

Mary O'Brien, 3rd Countess of Orkney is a human[1]. She was born on +1721-01-01T00:00:00Z[2]. She died on +1791-05-10T00:00:00Z[3]. She worked as a politician[4].

Key Facts

  • Mary O'Brien, 3rd Countess of Orkney was born on +1721-01-01T00:00:00Z[2].
  • Mary O'Brien, 3rd Countess of Orkney died on +1791-05-10T00:00:00Z[3].
  • Mary O'Brien, 3rd Countess of Orkney's father was William O'Brien, 4th Earl of Inchiquin[5].
  • Mary O'Brien, 3rd Countess of Orkney's mother was Anne O'Brien, 2nd Countess of Orkney[6].
  • Among Mary O'Brien, 3rd Countess of Orkney's spouses was Murrough O'Brien, 1st Marquess of Thomond[7].
  • A child of Mary O'Brien, 3rd Countess of Orkney was Mary FitzMaurice, 4th Countess of Orkney[8].
  • Mary O'Brien, 3rd Countess of Orkney worked as a politician[4].
  • Mary O'Brien, 3rd Countess of Orkney is recorded as female[9].
  • Mary O'Brien, 3rd Countess of Orkney's instance of is recorded as human[10].
  • Mary O'Brien, 3rd Countess of Orkney's Freebase ID is recorded as /m/0f9sg2[11].
  • Mary O'Brien, 3rd Countess of Orkney's family name is recorded as O'Brien[12].
  • Mary O'Brien, 3rd Countess of Orkney's given name is recorded as Mary[13].
  • Mary O'Brien, 3rd Countess of Orkney's British Museum person or institution ID is recorded as 150806[14].
  • Mary O'Brien, 3rd Countess of Orkney's genealogics.org person ID is recorded as I00222529[15].
  • Mary O'Brien, 3rd Countess of Orkney's WikiTree person ID is recorded as O'Brien-2629[16].
  • Mary O'Brien, 3rd Countess of Orkney's WeRelate person ID is recorded as Mary_O'Brien_(58)[17].
  • Mary O'Brien, 3rd Countess of Orkney's The Peerage person ID is recorded as p3834.htm#i38336[18].
  • Mary O'Brien, 3rd Countess of Orkney's Roglo person ID is recorded as p=mary;n=o brien;oc=19[19].
  • Mary O'Brien, 3rd Countess of Orkney's SNARC ID is recorded as Emanuel List[20].

Body

Origins and Family

Mary O'Brien, 3rd Countess of Orkney was born on +1721-01-01T00:00:00Z[2]. Her father was William O'Brien, 4th Earl of Inchiquin[5]. Her mother was Anne O'Brien, 2nd Countess of Orkney[6].

Career and Affiliations

Mary O'Brien, 3rd Countess of Orkney worked as a politician[4].

Personal Life

Mary O'Brien, 3rd Countess of Orkney was married to Murrough O'Brien, 1st Marquess of Thomond[7]. A child of her was Mary FitzMaurice, 4th Countess of Orkney[8].

Death and Burial

Mary O'Brien, 3rd Countess of Orkney died on +1791-05-10T00:00:00Z[3].

FAQs

Who were Mary O'Brien, 3rd Countess of Orkney's parents?

Mary O'Brien, 3rd Countess of Orkney's father was William O'Brien, 4th Earl of Inchiquin[5]. Mary O'Brien, 3rd Countess of Orkney's mother was Anne O'Brien, 2nd Countess of Orkney[6].

Who was Mary O'Brien, 3rd Countess of Orkney married to?

Mary O'Brien, 3rd Countess of Orkney's spouses include Murrough O'Brien, 1st Marquess of Thomond[7].

What did Mary O'Brien, 3rd Countess of Orkney do for work?

Mary O'Brien, 3rd Countess of Orkney worked as politician[4].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [9] ↑ . wikidata.org.
  2. [5] ↑ . wikidata.org.
  3. [6] ↑ . wikidata.org.
  4. [7] ↑ . Retrieved . wikidata.org.
  5. [10] ↑ . wikidata.org.
  6. [8] ↑ . wikidata.org.
  7. [4] ↑ . wikidata.org.
  8. [2] ↑ . wikidata.org.
  9. [3] ↑ . The Peerage. Retrieved . wikidata.org.
  10. [11] ↑ . wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [13] ↑ . wikidata.org.
  13. [14] ↑ . wikidata.org.
  14. [15] ↑ . wikidata.org.
  15. [16] ↑ . wikidata.org.
  16. [17] ↑ . wikidata.org.
  17. [18] ↑ . Retrieved . wikidata.org.
  18. [19] ↑ . wikidata.org.
  19. [20] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Mary O'Brien, 3rd Countess of Orkney. Retrieved May 3, 2026, from https://4ort.xyz/entity/mary-o-brien-3rd-countess-of-orkney
MLA “Mary O'Brien, 3rd Countess of Orkney.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/mary-o-brien-3rd-countess-of-orkney.
BibTeX @misc{4ortxyz_mary-o-brien-3rd-countess-of-orkney_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Mary O'Brien, 3rd Countess of Orkney}}, year = {2026}, url = {https://4ort.xyz/entity/mary-o-brien-3rd-countess-of-orkney}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Mary O'Brien, 3rd Countess of Orkney — https://4ort.xyz/entity/mary-o-brien-3rd-countess-of-orkney (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/mary-o-brien-3rd-countess-of-orkney · Last refreshed: