Mary Janssen

(died 1770)
Person human Q75343909
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Mary Janssen

Summary

Mary Janssen is a human[1]. She was born on +1715-00-00T00:00:00Z[2]. She died on +1770-03-25T00:00:00Z[3].

Key Facts

  • Mary Janssen was born on +1715-00-00T00:00:00Z[2].
  • Mary Janssen died on +1770-03-25T00:00:00Z[3].
  • Mary Janssen's father was Sir Theodore Janssen, 1st Baronet[4].
  • Mary Janssen's mother was Williamsa Henley[5].
  • Mary Janssen was married to Charles Calvert, 5th Baron Baltimore[6].
  • A child of Mary Janssen was Caroline Eden[7].
  • A child of Mary Janssen was Louisa Calvert[8].
  • A child of Mary Janssen was Frederick Calvert, 6th Baron Baltimore[9].
  • Mary Janssen is recorded as female[10].
  • Mary Janssen's instance of is recorded as human[11].
  • Mary Janssen's family name is recorded as Janssen[12].
  • Mary Janssen's given name is recorded as Mary[13].
  • Mary Janssen's genealogics.org person ID is recorded as I00186715[14].
  • Mary Janssen's Geni.com profile ID is recorded as 6000000012215900130[15].
  • Mary Janssen's WikiTree person ID is recorded as Janssen-380[16].
  • Mary Janssen's Kindred Britain ID is recorded as I17746[17].
  • Mary Janssen's The Peerage person ID is recorded as p7641.htm#i76410[18].

Body

Origins and Family

Mary Janssen was born on +1715-00-00T00:00:00Z[2]. Her father was Sir Theodore Janssen, 1st Baronet[4]. Her mother was Williamsa Henley[5].

Personal Life

Among Mary Janssen's spouses was Charles Calvert, 5th Baron Baltimore[6]. Children include Caroline Eden[7], b. 1745[19]; Louisa Calvert[8]; and Frederick Calvert, 6th Baron Baltimore[9], a politician[20], 1731–1771[21], awarded the Fellow of the Royal Society[22].

Death and Burial

Mary Janssen died on +1770-03-25T00:00:00Z[3].

FAQs

Who were Mary Janssen's parents?

Mary Janssen's father was Sir Theodore Janssen, 1st Baronet[4]. Mary Janssen's mother was Williamsa Henley[5].

Who was Mary Janssen married to?

Mary Janssen's spouses include Charles Calvert, 5th Baron Baltimore[6].

References

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

Direct Wikidata claims

  1. [10] . The Peerage. wikidata.org.
  2. [4] . The Peerage. wikidata.org.
  3. [5] . The Peerage. wikidata.org.
  4. [6] . Q75653886. Retrieved . wikidata.org.
  5. [11] . wikidata.org.
  6. [7] . The Peerage. wikidata.org.
  7. [8] . The Peerage. wikidata.org.
  8. [9] . The Peerage. wikidata.org.
  9. [2] . WikiTree. wikidata.org.
  10. [3] . The Peerage. 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.

Inline context (facts about related entities)

  1. [19] . Wikidata. wikidata.org. → on this site
  2. [20] . Wikidata. wikidata.org. → on this site
  3. [21] . Wikidata. wikidata.org. → on this site
  4. [22] . Wikidata. wikidata.org. → on this site

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 Janssen. Retrieved May 3, 2026, from https://4ort.xyz/entity/mary-janssen
MLA “Mary Janssen.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/mary-janssen.
BibTeX @misc{4ortxyz_mary-janssen_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Mary Janssen}}, year = {2026}, url = {https://4ort.xyz/entity/mary-janssen}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Mary Janssen — https://4ort.xyz/entity/mary-janssen (retrieved 2026-05-03)

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