Isabella of Castile, Duchess of Brittany
E1016931
Isabella of Castile, Duchess of Brittany, was a Spanish infanta of the House of Trastámara who became Duchess of Brittany through her marriage to John III, playing a diplomatic role in the ties between Castile and the Breton duchy in the early 16th century.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Isabella of Castile, Duchess of Brittany canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11925569 — 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: Isabella of Castile, Duchess of Brittany Context triple: [John III, Duke of Brittany, spouse, Isabella of Castile, Duchess of Brittany]
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A.
Isabella of Castile, Duchess of Burgundy
Isabella of Castile, Duchess of Burgundy, was a 15th-century Castilian infanta who became Duchess of Burgundy through marriage, linking the royal houses of Castile and Burgundy.
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B.
Isabella of Urgell, Duchess of Coimbra
Isabella of Urgell, Duchess of Coimbra was a 15th-century noblewoman from the House of Urgell who became a prominent figure in Portuguese politics and dynastic alliances through her marriage into the royal House of Aviz.
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C.
Isabella of Portugal, Duchess of Burgundy
Isabella of Portugal, Duchess of Burgundy, was a 15th-century Portuguese infanta who became a powerful and influential duchess through her marriage to Philip the Good, playing a key role in the politics and culture of the Burgundian court.
-
D.
Yolande of Aragon
Yolande of Aragon was a powerful 15th-century queen and political strategist, notably influential in French politics and a key supporter of Charles VII during the Hundred Years’ War.
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E.
Isabella of Barcelos
Isabella of Barcelos was a 15th-century Portuguese noblewoman from the House of Braganza who became Duchess of Burgundy through her marriage to Philip the Good.
- 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: Isabella of Castile, Duchess of Brittany Target entity description: Isabella of Castile, Duchess of Brittany, was a Spanish infanta of the House of Trastámara who became Duchess of Brittany through her marriage to John III, playing a diplomatic role in the ties between Castile and the Breton duchy in the early 16th century.
-
A.
Isabella of Castile, Duchess of Burgundy
Isabella of Castile, Duchess of Burgundy, was a 15th-century Castilian infanta who became Duchess of Burgundy through marriage, linking the royal houses of Castile and Burgundy.
-
B.
Isabella of Urgell, Duchess of Coimbra
Isabella of Urgell, Duchess of Coimbra was a 15th-century noblewoman from the House of Urgell who became a prominent figure in Portuguese politics and dynastic alliances through her marriage into the royal House of Aviz.
-
C.
Isabella of Portugal, Duchess of Burgundy
Isabella of Portugal, Duchess of Burgundy, was a 15th-century Portuguese infanta who became a powerful and influential duchess through her marriage to Philip the Good, playing a key role in the politics and culture of the Burgundian court.
-
D.
Yolande of Aragon
Yolande of Aragon was a powerful 15th-century queen and political strategist, notably influential in French politics and a key supporter of Charles VII during the Hundred Years’ War.
-
E.
Isabella of Barcelos
Isabella of Barcelos was a 15th-century Portuguese noblewoman from the House of Braganza who became Duchess of Burgundy through her marriage to Philip the Good.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
duchess consort of Brittany
ⓘ
infanta of Castile ⓘ noblewoman ⓘ |
| aristocraticTitleFrom |
Brittany
ⓘ
Castile ⓘ |
| countryOfCitizenship | Crown of Castile ⓘ |
| era | early 16th century ⓘ |
| father |
King of Castile (Trastámara dynasty)
ⓘ
linked to:
King of Castile
|
| gender | female ⓘ |
| givenName | Isabella ⓘ |
| house | House of Trastámara ⓘ |
| languageSpoken |
French
ⓘ
Spanish ⓘ |
| maritalStatus | married ⓘ |
| marriageType | dynastic marriage ⓘ |
| mother | Queen consort of Castile (Trastámara dynasty) ⓘ |
| nobleFamily |
Trastámara dynasty
ⓘ
linked to:
House of Trastámara
|
| nobleRank |
duchess
ⓘ
infanta ⓘ |
| notableFor |
diplomatic role in early 16th‑century European politics
ⓘ
strengthening ties between Castile and Brittany ⓘ |
| placeOfActivity |
Brittany
ⓘ
Castile ⓘ |
| positionHeld | Duchess consort of Brittany ⓘ |
| religion | Roman Catholicism ⓘ |
| role | diplomatic intermediary between Castile and Brittany ⓘ |
| socialClass | high nobility ⓘ |
| spouse | John III, Duke of Brittany ⓘ |
| title |
Duchess of Brittany
ⓘ
Infanta of Castile ⓘ |
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: Isabella of Castile, Duchess of Brittany Description of subject: Isabella of Castile, Duchess of Brittany, was a Spanish infanta of the House of Trastámara who became Duchess of Brittany through her marriage to John III, playing a diplomatic role in the ties between Castile and the Breton duchy in the early 16th century.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.