Geoffrey I, Duke of Brittany
E931688
Geoffrey I, Duke of Brittany was a late 10th- and early 11th-century Breton ruler known for consolidating ducal authority in Brittany and navigating complex alliances with the French crown and neighboring powers.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Geoffrey I, Duke of Brittany canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11362066 — 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: Geoffrey I, Duke of Brittany Context triple: [House of Rennes, hasMember, Geoffrey I, Duke of Brittany]
-
A.
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.
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B.
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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C.
Arthur I of Brittany
Arthur I of Brittany was a medieval Breton duke and Plantagenet prince whose disputed claim to the English throne against his uncle King John led to his mysterious disappearance and presumed murder.
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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.
-
E.
Alan IV, Duke of Brittany
Alan IV, Duke of Brittany was an 11th–12th century Breton ruler known for his participation in the First Crusade and his role in consolidating ducal authority in Brittany.
- 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: Geoffrey I, Duke of Brittany Target entity description: Geoffrey I, Duke of Brittany was a late 10th- and early 11th-century Breton ruler known for consolidating ducal authority in Brittany and navigating complex alliances with the French crown and neighboring powers.
-
A.
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.
-
B.
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.
-
C.
Arthur I of Brittany
Arthur I of Brittany was a medieval Breton duke and Plantagenet prince whose disputed claim to the English throne against his uncle King John led to his mysterious disappearance and presumed murder.
-
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.
Alan IV, Duke of Brittany
Alan IV, Duke of Brittany was an 11th–12th century Breton ruler known for his participation in the First Crusade and his role in consolidating ducal authority in Brittany.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Duke of Brittany
ⓘ
human ⓘ medieval ruler ⓘ |
| ally | Richard II, Duke of Normandy NERFINISHED ⓘ |
| burialPlace | Mont Saint-Michel NERFINISHED ⓘ |
| centuryOfActivity |
10th century
ⓘ
11th century ⓘ |
| child |
Adelaide of Brittany
NERFINISHED
ⓘ
Alan III, Duke of Brittany NERFINISHED ⓘ Odo, Count of Penthièvre NERFINISHED ⓘ |
| conflict | Counts of Blois NERFINISHED ⓘ |
| countryOfCitizenship | Duchy of Brittany NERFINISHED ⓘ |
| dateOfBirth | circa 980 ⓘ |
| dateOfDeath | 20 November 1008 ⓘ |
| deathCause | illness (reported) ⓘ |
| era | High Middle Ages ⓘ |
| ethnicGroup | Breton ⓘ |
| father | Conan I, Duke of Brittany NERFINISHED ⓘ |
| fatherInLaw | Richard I, Duke of Normandy NERFINISHED ⓘ |
| feudalAllegiance | Kingdom of France NERFINISHED ⓘ |
| givenName | Geoffrey NERFINISHED ⓘ |
| languageSpoken |
Breton
ⓘ
Latin ⓘ |
| memberOf | House of Rennes NERFINISHED ⓘ |
| mother | Ermengarde-Gerberga of Anjou NERFINISHED ⓘ |
| motherInLaw | Gunnor, Duchess of Normandy NERFINISHED ⓘ |
| nobleFamily | House of Rennes NERFINISHED ⓘ |
| nobleTitle | Duke of Brittany NERFINISHED ⓘ |
| notableFor |
alliances with the Duchy of Normandy
ⓘ
consolidation of ducal authority in Brittany ⓘ relations with the French crown ⓘ |
| occupation | duke ⓘ |
| placeOfDeath | Nantes NERFINISHED ⓘ |
| positionHeld | Duke of Brittany NERFINISHED ⓘ |
| predecessor | Conan I, Duke of Brittany NERFINISHED ⓘ |
| regionRuled | Brittany NERFINISHED ⓘ |
| reignEnd | 1008 ⓘ |
| reignStart | 992 ⓘ |
| religion |
Roman Catholicism
ⓘ
surface form:
Catholicism
|
| sexOrGender | male ⓘ |
| sibling | Judith of Brittany NERFINISHED ⓘ |
| spouse | Hawise of Normandy NERFINISHED ⓘ |
| successor | Alan III, Duke of Brittany NERFINISHED ⓘ |
| territory | Brittany NERFINISHED ⓘ |
| titleHeldFrom | Duke of Brittany, from 992 ⓘ |
| titleHeldUntil | Duke of Brittany, until 1008 ⓘ |
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: Geoffrey I, Duke of Brittany Description of subject: Geoffrey I, Duke of Brittany was a late 10th- and early 11th-century Breton ruler known for consolidating ducal authority in Brittany and navigating complex alliances with the French crown and neighboring powers.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.