Sejanus
E68521
Sejanus was a powerful Roman prefect of the Praetorian Guard under Emperor Tiberius, notorious for his political ambition and eventual execution for treason.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Lucius Aelius Sejanus | 7 |
| Sejanus canonical | 6 |
| Aelius Sejanus | 1 |
| Lucius Aelius Seianus | 1 |
| conspiracy of Sejanus | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T435222 — 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: Sejanus Context triple: [Tiberius, associatedWith, Sejanus]
-
A.
Caligula
Caligula was a first-century Roman emperor infamous for his autocratic rule, extravagance, and accounts of cruelty and madness.
-
B.
Nero
Nero was a 1st-century Roman emperor best known for his tyrannical rule, persecution of Christians, and association with the Great Fire of Rome.
-
C.
Agrippina the Younger
Agrippina the Younger was a powerful and politically influential Roman empress, mother of Emperor Nero, and a key figure in the Julio-Claudian dynasty.
-
D.
Agrippina the Elder
Agrippina the Elder was a prominent Roman noblewoman and granddaughter of Augustus, known for her political influence, military travels with her husband Germanicus, and tragic conflict with Emperor Tiberius.
-
E.
Commodus
Commodus was a Roman emperor (reigned 180–192 AD) known for his erratic rule, self-indulgence, and association with the decline of the Roman Empire.
- 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: Sejanus Target entity description: Sejanus was a powerful Roman prefect of the Praetorian Guard under Emperor Tiberius, notorious for his political ambition and eventual execution for treason.
-
A.
Caligula
Caligula was a first-century Roman emperor infamous for his autocratic rule, extravagance, and accounts of cruelty and madness.
-
B.
Nero
Nero was a 1st-century Roman emperor best known for his tyrannical rule, persecution of Christians, and association with the Great Fire of Rome.
-
C.
Agrippina the Younger
Agrippina the Younger was a powerful and politically influential Roman empress, mother of Emperor Nero, and a key figure in the Julio-Claudian dynasty.
-
D.
Agrippina the Elder
Agrippina the Elder was a prominent Roman noblewoman and granddaughter of Augustus, known for her political influence, military travels with her husband Germanicus, and tragic conflict with Emperor Tiberius.
-
E.
Commodus
Commodus was a Roman emperor (reigned 180–192 AD) known for his erratic rule, self-indulgence, and association with the decline of the Roman Empire.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Roman politician
ⓘ
ancient Roman ⓘ praetorian prefect ⓘ |
| accusationBy | Tiberius ⓘ |
| alternativeName |
Sejanus
ⓘ
surface form:
Aelius Sejanus
Sejanus ⓘ
surface form:
Lucius Aelius Seianus
|
| associatedWith |
Julio-Claudian dynasty
ⓘ
Praetorian Guard ⓘ Tiberius ⓘ |
| birthPlace |
Vulci
ⓘ
surface form:
Volsinii
|
| causeOfDeath | execution ⓘ |
| charge | treason ⓘ |
| citizenship |
Roman Antiquity
ⓘ
surface form:
Ancient Rome
Roman Empire ⓘ |
| countryOfDeath | Roman Empire ⓘ |
| culture | Ancient Roman culture ⓘ |
| dateOfDeath | 31 ⓘ |
| deathEvent | fall of Sejanus ⓘ |
| deathPlace | Rome ⓘ |
| employer | Tiberius ⓘ |
| familyName | Aelius ⓘ |
| father | Lucius Seius Strabo ⓘ |
| fullName |
Sejanus
self-linksurface differs
ⓘ
surface form:
Lucius Aelius Sejanus
|
| givenName | Lucius ⓘ |
| historicalPeriod |
Julio-Claudian dynasty
ⓘ
surface form:
Julio-Claudian era
early Roman Empire ⓘ |
| legalStatusAtDeath | condemned criminal ⓘ |
| mentionedIn |
Annals by Tacitus
ⓘ
De vita Caesarum ⓘ
surface form:
Suetonius' Lives of the Caesars
works of Cassius Dio ⓘ |
| notableEvent |
concentration of Praetorian cohorts in a single camp near Rome
ⓘ
reorganization of the Praetorian Guard ⓘ |
| notableFor |
control of the Praetorian Guard
ⓘ
influence over Emperor Tiberius ⓘ political ambition ⓘ purges of Roman aristocrats ⓘ |
| officeEnd | 31 ⓘ |
| officeStart |
as praetorian prefect, circa 14
ⓘ
gained sole command of Praetorian Guard in 15 ⓘ |
| opponent |
Agrippina the Elder
ⓘ
Drusus Julius Caesar ⓘ members of the Julio-Claudian dynasty ⓘ |
| politicalFaction | supporters of Tiberius ⓘ |
| positionHeld |
commander of the Praetorian Guard
ⓘ
praetorian prefect ⓘ |
| posthumousConsequence | damnatio memoriae ⓘ |
| relative | Lucius Seius Strabo ⓘ |
| servedUnder | Tiberius ⓘ |
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: Sejanus Description of subject: Sejanus was a powerful Roman prefect of the Praetorian Guard under Emperor Tiberius, notorious for his political ambition and eventual execution for treason.
Referenced by (16)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Lucius Aelius Sejanus
this entity surface form:
Aelius Sejanus
this entity surface form:
Lucius Aelius Seianus
subject surface form:
Annals
this entity surface form:
conspiracy of Sejanus
this entity surface form:
Lucius Aelius Sejanus
this entity surface form:
Lucius Aelius Sejanus
this entity surface form:
Lucius Aelius Sejanus
this entity surface form:
Lucius Aelius Sejanus
this entity surface form:
Lucius Aelius Sejanus
this entity surface form:
Lucius Aelius Sejanus