Conservative Party leadership election 1990
E301619
The Conservative Party leadership election of 1990 was the internal party contest that led to John Major succeeding Margaret Thatcher as leader of the Conservative Party and Prime Minister of the United Kingdom.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Conservative Party leadership election 1990 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2812607 — 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: Conservative Party leadership election 1990 Context triple: [John Major: The Autobiography, about, Conservative Party leadership election 1990]
-
A.
2007 Labour Party leadership election
The 2007 Labour Party leadership election was the internal contest in which Gordon Brown succeeded Tony Blair as leader of the UK Labour Party and Prime Minister.
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B.
2010 Labour Party leadership election
The 2010 Labour Party leadership election was the contest held to choose Gordon Brown’s successor as leader of the UK Labour Party following its defeat in the 2010 general election.
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C.
Conservative Party Conference
The Conservative Party Conference is the annual gathering of the UK Conservative Party where leaders, members, and affiliated groups meet to set policy direction, deliver speeches, and conduct party business.
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D.
2015 Labour Party leadership election
The 2015 Labour Party leadership election was the contest that unexpectedly propelled long-time left-wing backbencher Jeremy Corbyn to the leadership of the UK Labour Party, dramatically reshaping its political direction.
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E.
Margaret Thatcher government
The Margaret Thatcher government was the Conservative administration that led the United Kingdom from 1979 to 1990, marked by free-market economic reforms, privatization, and a strong stance against trade unions.
- 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: Conservative Party leadership election 1990 Target entity description: The Conservative Party leadership election of 1990 was the internal party contest that led to John Major succeeding Margaret Thatcher as leader of the Conservative Party and Prime Minister of the United Kingdom.
-
A.
2007 Labour Party leadership election
The 2007 Labour Party leadership election was the internal contest in which Gordon Brown succeeded Tony Blair as leader of the UK Labour Party and Prime Minister.
-
B.
2010 Labour Party leadership election
The 2010 Labour Party leadership election was the contest held to choose Gordon Brown’s successor as leader of the UK Labour Party following its defeat in the 2010 general election.
-
C.
Conservative Party Conference
The Conservative Party Conference is the annual gathering of the UK Conservative Party where leaders, members, and affiliated groups meet to set policy direction, deliver speeches, and conduct party business.
-
D.
2015 Labour Party leadership election
The 2015 Labour Party leadership election was the contest that unexpectedly propelled long-time left-wing backbencher Jeremy Corbyn to the leadership of the UK Labour Party, dramatically reshaping its political direction.
-
E.
Margaret Thatcher government
The Margaret Thatcher government was the Conservative administration that led the United Kingdom from 1979 to 1990, marked by free-market economic reforms, privatization, and a strong stance against trade unions.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
Conservative Party leadership election
ⓘ
United Kingdom party leadership election ⓘ |
| context | internal leadership rules of the Conservative Party (UK) ⓘ |
| country | United Kingdom ⓘ |
| electorate |
Conservative Party MP
ⓘ
surface form:
Conservative Members of Parliament
|
| endDate | 1990-11-27 ⓘ |
| firstBallotCandidate |
Margaret Thatcher
ⓘ
Michael Heseltine ⓘ |
| firstBallotDate | 1990-11-20 ⓘ |
| followedBy | Conservative Party leadership election 1995 ⓘ |
| follows | Conservative Party leadership election 1989 ⓘ |
| historicalPeriod | late Thatcher era ⓘ |
| incumbentLeaderBeforeElection | Margaret Thatcher ⓘ |
| incumbentPrimeMinisterBeforeElection | Margaret Thatcher ⓘ |
| leaderAfterElection | John Major ⓘ |
| location | Palace of Westminster ⓘ |
| loser |
Douglas Hurd
ⓘ
Michael Heseltine ⓘ |
| notableFor | first successful leadership challenge to a sitting Conservative Prime Minister in the 20th century ⓘ |
| officeAssumedByWinner | Prime Minister of the United Kingdom ⓘ |
| officeAssumedDateByWinner | 1990-11-28 ⓘ |
| party | Conservative Party (UK) ⓘ |
| positionContested | Leader of the Conservative Party (UK) ⓘ |
| predecessorAsPrimeMinister | Margaret Thatcher ⓘ |
| primeMinisterAfterElection | John Major ⓘ |
| reasonForResignation | failure of Margaret Thatcher to win outright in first ballot ⓘ |
| relatedEvent |
Poll Tax Riots
ⓘ
surface form:
Poll Tax controversy
divisions over European integration in the Conservative Party ⓘ |
| resultedIn |
beginning of John Major's premiership
ⓘ
end of Margaret Thatcher's premiership ⓘ |
| secondBallotCandidate |
Douglas Hurd
ⓘ
John Major ⓘ Michael Heseltine ⓘ |
| secondBallotDate | 1990-11-27 ⓘ |
| startDate | 1990-11-20 ⓘ |
| successorAsPrimeMinister | John Major ⓘ |
| triggeredBy |
leadership challenge to Margaret Thatcher
ⓘ
resignation of Margaret Thatcher as Conservative Party leader ⓘ |
| typeOfVote | secret ballot ⓘ |
| votingBody |
Conservative Party (UK)
ⓘ
surface form:
Parliamentary Conservative Party
|
| winner | John Major ⓘ |
| year | 1990 ⓘ |
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: Conservative Party leadership election 1990 Description of subject: The Conservative Party leadership election of 1990 was the internal party contest that led to John Major succeeding Margaret Thatcher as leader of the Conservative Party and Prime Minister of the United Kingdom.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
Autobiography "John Major: The Autobiography"
→
about
→
Conservative Party leadership election 1990
ⓘ
subject surface form:
John Major: The Autobiography