Costa v ENEL
E312027
Costa v ENEL is a landmark 1964 judgment of the European Court of Justice that established the primacy of European Union law over conflicting national law.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Costa v ENEL canonical | 8 |
| Costa v ENEL (1964) | 1 |
| Flaminio Costa v E.N.E.L. | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2931923 — 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: Costa v ENEL Context triple: [European Union legal order, originatedInCase, Costa v ENEL]
-
A.
Fortum
Fortum is a Finnish state-owned energy company that focuses on electricity generation, district heating, and related energy services across the Nordic and Baltic regions, Poland, and India.
-
B.
Energetica
Energetica is an interactive exhibition at Amsterdam’s NEMO Science Museum that explores the principles and applications of sustainable energy and natural forces.
-
C.
E.ON
E.ON is a major European energy company based in Germany that focuses on electricity generation, renewable energy, and energy infrastructure services.
-
D.
Engie
Engie is a major French multinational utility company specializing in electricity, natural gas, and energy services, with a strong focus on renewable and low-carbon energy solutions.
-
E.
Lanco
Lanco is a small Chilean city located in the Los Ríos Region, known primarily as an agricultural and service center for the surrounding rural area.
- 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: Costa v ENEL Target entity description: Costa v ENEL is a landmark 1964 judgment of the European Court of Justice that established the primacy of European Union law over conflicting national law.
-
A.
Fortum
Fortum is a Finnish state-owned energy company that focuses on electricity generation, district heating, and related energy services across the Nordic and Baltic regions, Poland, and India.
-
B.
Energetica
Energetica is an interactive exhibition at Amsterdam’s NEMO Science Museum that explores the principles and applications of sustainable energy and natural forces.
-
C.
E.ON
E.ON is a major European energy company based in Germany that focuses on electricity generation, renewable energy, and energy infrastructure services.
-
D.
Engie
Engie is a major French multinational utility company specializing in electricity, natural gas, and energy services, with a strong focus on renewable and low-carbon energy solutions.
-
E.
Lanco
Lanco is a small Chilean city located in the Los Ríos Region, known primarily as an agricultural and service center for the surrounding rural area.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
European Court of Justice case
ⓘ
case law ⓘ landmark judgment ⓘ |
| areaOfLaw |
EU institutional law
ⓘ
constitutional law of the European Union ⓘ |
| articleInterpreted |
Article 102 EEC Treaty
ⓘ
linked to:
Article 82 EC Treaty
Article 177 EEC Treaty ⓘ Article 189 EEC Treaty ⓘ |
| caseNumber | 6/64 ⓘ |
| citedBy |
Factortame (No. 2)
ⓘ
Internationale Handelsgesellschaft mbH v Einfuhr- und Vorratsstelle für Getreide und Futtermittel ⓘ Simmenthal II ⓘ
linked to:
Simmenthal
|
| countryOfOrigin | Italy ⓘ |
| court |
European Court of Justice
ⓘ
linked to:
Court of Justice of the European Union
|
| decisionDate | 1964-07-15 ⓘ |
| decisionType | preliminary ruling on interpretation of Community law ⓘ |
| defendant | Ente Nazionale per l'Energia Elettrica ⓘ |
| defendantAbbreviation | ENEL ⓘ |
| field |
European Union law
ⓘ
linked to:
European Union legal order
|
| fullCaseName |
Flaminio Costa v E.N.E.L.
ⓘ
linked to:
Costa v ENEL
|
| hasParty |
Ente Nazionale per l'Energia Elettrica
ⓘ
Flaminio Costa ⓘ |
| importance |
foundational case for EU legal order
ⓘ
key authority on supremacy of EU law ⓘ |
| jurisdiction |
European Economic Community
ⓘ
European Union legal order ⓘ |
| languageOfProceedings | Italian ⓘ |
| legalEffect | binding precedent in EU law ⓘ |
| legalPrincipleEstablished |
direct effect of certain Treaty provisions
ⓘ
primacy of EU law over national law ⓘ supremacy of European Union law ⓘ |
| legalSystem |
EU law
ⓘ
linked to:
European Union legal order
|
| originatingCourt | Giudice conciliatore di Milano ⓘ |
| plaintiff | Flaminio Costa ⓘ |
| procedureType | preliminary ruling ⓘ |
| regionConcerned |
Member States of the European Economic Community
ⓘ
linked to:
Member States of the European Union
|
| relatedCase |
Van Gend en Loos v Nederlandse Administratie der Belastingen
ⓘ
linked to:
Van Gend en Loos
|
| relatedConcept |
autonomy of EU legal order
ⓘ
direct effect ⓘ supremacy of EU law ⓘ |
| result | affirmation of primacy of Community law over later national law ⓘ |
| shortName | Costa v ENEL ⓘ |
| subjectMatter |
conflict between national law and Community law
ⓘ
primacy of Community law ⓘ |
| treatyInterpreted |
EEC Treaty
ⓘ
linked to:
Treaty of Rome
Treaty establishing the European Economic Community ⓘ
linked to:
Treaty of Rome
|
| yearDecided | 1964 ⓘ |
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: Costa v ENEL Description of subject: Costa v ENEL is a landmark 1964 judgment of the European Court of Justice that established the primacy of European Union law over conflicting national law.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Costa v ENEL
linked to: Costa v ENEL