Arthur I of Brittany
E536848
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Arthur I of Brittany canonical | 1 |
| Arthur I, Duke of Brittany | 1 |
| Arthur de Bretagne | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5598919 — 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: Arthur I of Brittany Context triple: [Prince Arthur, Duke of Brittany, fullName, Arthur I of Brittany]
-
A.
Duke of Brittany
The Duke of Brittany was the sovereign or semi-sovereign ruler of the historic region of Brittany in northwestern France, holding a ducal title central to the area's medieval political and cultural identity.
-
B.
Arthur II, Duke of Brittany
Arthur II, Duke of Brittany was a late 13th- and early 14th-century Breton ruler from the House of Dreux who governed the Duchy of Brittany under French suzerainty and navigated complex feudal and dynastic politics of medieval France.
-
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.
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.
-
E.
King of Brittany
The King of Brittany was the medieval sovereign ruler of the historical region of Brittany in western France, preceding the later ducal authority.
- 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: Arthur I of Brittany Target entity description: 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.
-
A.
Duke of Brittany
The Duke of Brittany was the sovereign or semi-sovereign ruler of the historic region of Brittany in northwestern France, holding a ducal title central to the area's medieval political and cultural identity.
-
B.
Arthur II, Duke of Brittany
Arthur II, Duke of Brittany was a late 13th- and early 14th-century Breton ruler from the House of Dreux who governed the Duchy of Brittany under French suzerainty and navigated complex feudal and dynastic politics of medieval France.
-
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.
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.
-
E.
King of Brittany
The King of Brittany was the medieval sovereign ruler of the historical region of Brittany in western France, preceding the later ducal authority.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Duke of Brittany
ⓘ
Plantagenet prince ⓘ heir apparent ⓘ medieval ruler ⓘ nobleman ⓘ |
| allegiance |
Duchy of Brittany
NERFINISHED
ⓘ
Kingdom of France ⓘ |
| associatedWith |
Anglo-French conflicts
ⓘ
Plantagenet succession crisis NERFINISHED ⓘ |
| birthDate | 1187-03-29 ⓘ |
| birthPlace |
Duchy of Brittany
NERFINISHED
ⓘ
Nantes NERFINISHED ⓘ |
| capturedAt | Battle of Mirebeau NERFINISHED ⓘ |
| capturedBy | John, King of England NERFINISHED ⓘ |
| capturedDate | 1202-07-31 ⓘ |
| claimantTo | throne of England ⓘ |
| deathCause | presumed murder ⓘ |
| deathDate | 1203-04-03 ⓘ |
| deathPlace |
Normandy
NERFINISHED
ⓘ
Rouen NERFINISHED ⓘ |
| disappeared | 1203 ⓘ |
| father | Geoffrey II, Duke of Brittany NERFINISHED ⓘ |
| fullName | Arthur I of Brittany NERFINISHED ⓘ |
| givenName | Arthur NERFINISHED ⓘ |
| grandfather | Henry II of England NERFINISHED ⓘ |
| grandmother | Eleanor of Aquitaine NERFINISHED ⓘ |
| heldPrisonerAt |
Falaise
NERFINISHED
ⓘ
Rouen NERFINISHED ⓘ |
| historicalEra | High Middle Ages NERFINISHED ⓘ |
| house | House of Plantagenet NERFINISHED ⓘ |
| languageSpoken |
Breton
ⓘ
Old French ⓘ |
| legalStatus | posthumously declared dead ⓘ |
| mother | Constance, Duchess of Brittany NERFINISHED ⓘ |
| nobleFamily | Plantagenet NERFINISHED ⓘ |
| notableFor |
disputed succession to the English throne
ⓘ
mysterious disappearance in 1203 ⓘ |
| predecessor | Constance, Duchess of Brittany NERFINISHED ⓘ |
| reignEnd | 1203 ⓘ |
| reignStart | 1187 ⓘ |
| religion |
Roman Catholicism
ⓘ
surface form:
Catholicism
|
| rival | John, King of England NERFINISHED ⓘ |
| sibling | Eleanor, Fair Maid of Brittany NERFINISHED ⓘ |
| successor | Alix of Thouars NERFINISHED ⓘ |
| supportedBy | Philip II of France NERFINISHED ⓘ |
| title |
Duke of Brittany
NERFINISHED
ⓘ
Earl of Richmond NERFINISHED ⓘ |
| uncle |
John, King of England
NERFINISHED
ⓘ
Richard I of England 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: Arthur I of Brittany Description of subject: 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.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Arthur I, Duke of Brittany
this entity surface form:
Arthur de Bretagne