2nd Marquess of Londonderry
E665386
British statesman
Foreign Secretary of the United Kingdom
Member of Parliament of the United Kingdom
human
nobleman
The 2nd Marquess of Londonderry was the Irish-born British statesman Robert Stewart, Viscount Castlereagh, a leading foreign secretary and architect of European diplomacy during and after the Napoleonic Wars.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Robert Stewart, 1st Marquess of Londonderry | 2 |
| 2nd Marquess of Londonderry canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7396027 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: 2nd Marquess of Londonderry Context triple: [Robert Stewart, Viscount Castlereagh, title, 2nd Marquess of Londonderry]
-
A.
Marquess of Londonderry
The Marquess of Londonderry is a hereditary title in the Peerage of Ireland and later the United Kingdom, historically associated with a prominent Anglo-Irish aristocratic family influential in British politics and society.
-
B.
Marquess of Donegall
The Marquess of Donegall is a title in the Peerage of Ireland historically associated with the Chichester family, prominent Anglo-Irish landowners and political figures particularly linked to Belfast and County Antrim.
-
C.
Charles Vane, 3rd Marquess of Londonderry
Charles Vane, 3rd Marquess of Londonderry was a 19th-century British aristocrat and Conservative politician who held high office, including serving as Lord Lieutenant of Ireland.
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D.
Viscount Sarsfield
Viscount Sarsfield is an Irish noble title most famously associated with Patrick Sarsfield, a Jacobite military leader renowned for his role in the Williamite War in Ireland.
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E.
James Hamilton, 1st Duke of Abercorn
James Hamilton, 1st Duke of Abercorn, was a prominent 19th-century British Conservative politician and nobleman who served as Lord Lieutenant of Ireland and head of the influential Abercorn branch of the Hamilton family.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: 2nd Marquess of Londonderry Target entity description: The 2nd Marquess of Londonderry was the Irish-born British statesman Robert Stewart, Viscount Castlereagh, a leading foreign secretary and architect of European diplomacy during and after the Napoleonic Wars.
-
A.
Marquess of Londonderry
The Marquess of Londonderry is a hereditary title in the Peerage of Ireland and later the United Kingdom, historically associated with a prominent Anglo-Irish aristocratic family influential in British politics and society.
-
B.
Marquess of Donegall
The Marquess of Donegall is a title in the Peerage of Ireland historically associated with the Chichester family, prominent Anglo-Irish landowners and political figures particularly linked to Belfast and County Antrim.
-
C.
Charles Vane, 3rd Marquess of Londonderry
Charles Vane, 3rd Marquess of Londonderry was a 19th-century British aristocrat and Conservative politician who held high office, including serving as Lord Lieutenant of Ireland.
-
D.
Viscount Sarsfield
Viscount Sarsfield is an Irish noble title most famously associated with Patrick Sarsfield, a Jacobite military leader renowned for his role in the Williamite War in Ireland.
-
E.
James Hamilton, 1st Duke of Abercorn
James Hamilton, 1st Duke of Abercorn, was a prominent 19th-century British Conservative politician and nobleman who served as Lord Lieutenant of Ireland and head of the influential Abercorn branch of the Hamilton family.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
British statesman
ⓘ
Foreign Secretary of the United Kingdom ⓘ Member of Parliament of the United Kingdom ⓘ human ⓘ nobleman ⓘ |
| alsoKnownAs |
Lord Castlereagh
NERFINISHED
ⓘ
Viscount Castlereagh NERFINISHED ⓘ |
| burialPlace | Westminster Abbey NERFINISHED ⓘ |
| causeOfDeath | suicide by cutting his throat ⓘ |
| countryOfBirth | Ireland NERFINISHED ⓘ |
| countryOfCitizenship |
Kingdom of Great Britain
ⓘ
United Kingdom of Great Britain and Ireland ⓘ |
| dateOfBirth | 1769-06-18 ⓘ |
| dateOfDeath | 1822-08-12 ⓘ |
| educatedAt |
Royal School, Armagh
NERFINISHED
ⓘ
St John’s College, Cambridge NERFINISHED ⓘ |
| father | Robert Stewart, 1st Marquess of Londonderry NERFINISHED ⓘ |
| ideology | conservatism ⓘ |
| knownFor |
architect of the Concert of Europe
ⓘ
leading British foreign policy during the Napoleonic Wars ⓘ role in the Act of Union 1800 between Great Britain and Ireland ⓘ |
| mannerOfDeath | suicide ⓘ |
| memberOf |
British House of Commons
NERFINISHED
ⓘ
British House of Lords NERFINISHED ⓘ |
| monarchDuringTerm |
George III
NERFINISHED
ⓘ
George IV NERFINISHED ⓘ |
| mother | Lady Sarah Frances Seymour NERFINISHED ⓘ |
| name | Robert Stewart NERFINISHED ⓘ |
| notableWork |
involvement in the Quadruple Alliance of 1815
ⓘ
involvement in the Treaty of Chaumont ⓘ role in the Congress of Vienna ⓘ shaping the post-Napoleonic European settlement ⓘ |
| parliamentaryGroup | Tory Party NERFINISHED ⓘ |
| placeOfBirth | Dublin ⓘ |
| placeOfDeath | Londonderry House, London NERFINISHED ⓘ |
| positionHeld |
Chief Secretary for Ireland
NERFINISHED
ⓘ
Leader of the House of Commons NERFINISHED ⓘ President of the Board of Control NERFINISHED ⓘ Secretary of State for Foreign Affairs NERFINISHED ⓘ Secretary of State for War and the Colonies NERFINISHED ⓘ |
| primeMinisterDuringTerm |
Robert Jenkinson, 2nd Earl of Liverpool
NERFINISHED
ⓘ
Spencer Perceval NERFINISHED ⓘ |
| religion | Anglicanism ⓘ |
| spouse | Amelia Hobart NERFINISHED ⓘ |
| termEnd | Foreign Secretary: 1822 ⓘ |
| termStart | Foreign Secretary: 1812 ⓘ |
| title |
2nd Marquess of Londonderry
NERFINISHED
ⓘ
Baron Stewart NERFINISHED ⓘ Viscount Castlereagh NERFINISHED ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: 2nd Marquess of Londonderry Description of subject: The 2nd Marquess of Londonderry was the Irish-born British statesman Robert Stewart, Viscount Castlereagh, a leading foreign secretary and architect of European diplomacy during and after the Napoleonic Wars.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Robert Stewart, 1st Marquess of Londonderry
this entity surface form:
Robert Stewart, 1st Marquess of Londonderry