John IV, Duke of Brittany
E284923
John IV, Duke of Brittany was a 14th-century Breton nobleman whose turbulent reign was marked by the Breton War of Succession and complex alliances with both England and France during the Hundred Years’ War.
All labels observed (2)
| Label | Occurrences |
|---|---|
| John IV, Duke of Brittany canonical | 14 |
| Jean IV de Bretagne | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2457918 — 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: John IV, Duke of Brittany Context triple: [Duke of Brittany, officeHolder, John IV, Duke of Brittany]
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A.
John III, Duke of Brittany
John III, Duke of Brittany was a 14th-century Breton ruler whose childless reign and succession disputes helped trigger the Breton War of Succession.
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B.
John II, Duke of Brittany
John II, Duke of Brittany was a 13th-century French nobleman who ruled the Duchy of Brittany and played a significant role in the politics of the Capetian kingdom.
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C.
John I, Duke of Brittany
John I, Duke of Brittany was a 13th-century Breton nobleman who ruled the Duchy of Brittany and played a significant role in the politics of medieval France.
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D.
Conan IV, Duke of Brittany
Conan IV, Duke of Brittany was a 12th-century Breton nobleman who ruled the Duchy of Brittany and became a key figure in the complex dynastic struggles between the Angevin kings of England and the French crown.
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E.
Geoffrey II, Duke of Brittany
Geoffrey II, Duke of Brittany was a 12th-century French nobleman, son of Henry II of England and brother of Richard the Lionheart, who ruled Brittany through his marriage to Constance and died young in a tournament accident.
- 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: John IV, Duke of Brittany Target entity description: John IV, Duke of Brittany was a 14th-century Breton nobleman whose turbulent reign was marked by the Breton War of Succession and complex alliances with both England and France during the Hundred Years’ War.
-
A.
John III, Duke of Brittany
John III, Duke of Brittany was a 14th-century Breton ruler whose childless reign and succession disputes helped trigger the Breton War of Succession.
-
B.
John II, Duke of Brittany
John II, Duke of Brittany was a 13th-century French nobleman who ruled the Duchy of Brittany and played a significant role in the politics of the Capetian kingdom.
-
C.
John I, Duke of Brittany
John I, Duke of Brittany was a 13th-century Breton nobleman who ruled the Duchy of Brittany and played a significant role in the politics of medieval France.
-
D.
Conan IV, Duke of Brittany
Conan IV, Duke of Brittany was a 12th-century Breton nobleman who ruled the Duchy of Brittany and became a key figure in the complex dynastic struggles between the Angevin kings of England and the French crown.
-
E.
Geoffrey II, Duke of Brittany
Geoffrey II, Duke of Brittany was a 12th-century French nobleman, son of Henry II of England and brother of Richard the Lionheart, who ruled Brittany through his marriage to Constance and died young in a tournament accident.
- F. None of above. chosen
Statements (50)
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: John IV, Duke of Brittany Description of subject: John IV, Duke of Brittany was a 14th-century Breton nobleman whose turbulent reign was marked by the Breton War of Succession and complex alliances with both England and France during the Hundred Years’ War.
Referenced by (15)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Jean IV de Bretagne
subject surface form:
Mary of Waltham