Constantine II of Bulgaria
E1027186
Constantine II of Bulgaria was the last tsar of the medieval Bulgarian Empire, ruling in the late 14th and early 15th centuries during its final struggle against Ottoman conquest.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Constantine II of Bulgaria canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T12415485 — 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: Constantine II of Bulgaria Context triple: [Shishman dynasty, hasMember, Constantine II of Bulgaria]
-
A.
Boris II of Bulgaria
Boris II of Bulgaria was a 10th-century Bulgarian tsar whose short and troubled reign marked the beginning of the decline of the First Bulgarian Empire under Byzantine pressure.
-
B.
Presian I of Bulgaria
Presian I of Bulgaria was a 9th-century khan who significantly expanded the First Bulgarian Empire into the Balkans prior to the Christianization under his successor Boris I.
-
C.
Alexander I of Bulgaria
Alexander I of Bulgaria was the first modern ruler of an autonomous Bulgaria after Ottoman rule, reigning as prince from 1879 to 1886 during the formative years of the Bulgarian state.
-
D.
Peter IV of Bulgaria
Peter IV of Bulgaria was a medieval Bulgarian tsar who played a key role in the restoration of Bulgarian independence and the establishment of the Second Bulgarian Empire in the late 12th century.
-
E.
Michael II Asen of Bulgaria
Michael II Asen of Bulgaria was a 13th-century tsar of the Second Bulgarian Empire from the Asen dynasty, known for his troubled reign marked by internal strife and foreign intervention.
- 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: Constantine II of Bulgaria Target entity description: Constantine II of Bulgaria was the last tsar of the medieval Bulgarian Empire, ruling in the late 14th and early 15th centuries during its final struggle against Ottoman conquest.
-
A.
Boris II of Bulgaria
Boris II of Bulgaria was a 10th-century Bulgarian tsar whose short and troubled reign marked the beginning of the decline of the First Bulgarian Empire under Byzantine pressure.
-
B.
Presian I of Bulgaria
Presian I of Bulgaria was a 9th-century khan who significantly expanded the First Bulgarian Empire into the Balkans prior to the Christianization under his successor Boris I.
-
C.
Alexander I of Bulgaria
Alexander I of Bulgaria was the first modern ruler of an autonomous Bulgaria after Ottoman rule, reigning as prince from 1879 to 1886 during the formative years of the Bulgarian state.
-
D.
Peter IV of Bulgaria
Peter IV of Bulgaria was a medieval Bulgarian tsar who played a key role in the restoration of Bulgarian independence and the establishment of the Second Bulgarian Empire in the late 12th century.
-
E.
Michael II Asen of Bulgaria
Michael II Asen of Bulgaria was a 13th-century tsar of the Second Bulgarian Empire from the Asen dynasty, known for his troubled reign marked by internal strife and foreign intervention.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Bulgarian tsar
ⓘ
medieval ruler ⓘ monarch ⓘ |
| ally |
Hungary
NERFINISHED
ⓘ
Serbian Despotate NERFINISHED ⓘ Wallachia NERFINISHED ⓘ |
| associatedWith |
fall of Vidin to the Ottomans
ⓘ
fragmentation of the Second Bulgarian Empire ⓘ |
| birthPlace | Vidin (probable) NERFINISHED ⓘ |
| chronologicalOrder | last medieval Bulgarian tsar ⓘ |
| conflict |
Ottoman conquest of Bulgaria
NERFINISHED
ⓘ
Ottoman–Bulgarian wars NERFINISHED ⓘ |
| coRulerWith | Ivan Sratsimir of Bulgaria NERFINISHED ⓘ |
| country | Bulgaria ⓘ |
| deathDate | 1422 ⓘ |
| deathPlace | Serbia (probable) NERFINISHED ⓘ |
| dynasty | Sratsimir dynasty NERFINISHED ⓘ |
| ethnicity | Bulgarian ⓘ |
| father | Ivan Sratsimir of Bulgaria NERFINISHED ⓘ |
| governmentType | monarchy ⓘ |
| historicalPeriod | Late Middle Ages ⓘ |
| historicalRegion | Vidin Tsardom NERFINISHED ⓘ |
| knownAs | Konstantin II Asen NERFINISHED ⓘ |
| language | Bulgarian ⓘ |
| legacy | symbol of the end of medieval Bulgarian statehood ⓘ |
| mother | Anna of Wallachia NERFINISHED ⓘ |
| notableFor |
being the last tsar of the medieval Bulgarian Empire
ⓘ
resistance against Ottoman expansion ⓘ |
| opponent |
Ottoman Empire
ⓘ
Sultan Bayezid I NERFINISHED ⓘ Sultan Mehmed I NERFINISHED ⓘ |
| partOf | Second Bulgarian Empire (residual state) NERFINISHED ⓘ |
| positionHeld | Tsar of Bulgaria NERFINISHED ⓘ |
| predecessor | Ivan Sratsimir of Bulgaria NERFINISHED ⓘ |
| regionRuled |
northwestern Bulgaria
NERFINISHED
ⓘ
territories around Vidin on the Danube ⓘ |
| reignEnd | 1422 ⓘ |
| reignStart | circa 1397 ⓘ |
| religion | Eastern Orthodox Christianity ⓘ |
| ruledFrom | Vidin NERFINISHED ⓘ |
| style | autocrat of all Bulgarians (traditional tsarist style) ⓘ |
| succeededBy | Ottoman provincial administration in former Bulgarian lands ⓘ |
| successor | none (Bulgarian tsardom ceased to exist) ⓘ |
| successorState | Ottoman Empire in Bulgarian lands NERFINISHED ⓘ |
| title |
Tsar of Bulgaria
NERFINISHED
ⓘ
Tsar of Vidin 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: Constantine II of Bulgaria Description of subject: Constantine II of Bulgaria was the last tsar of the medieval Bulgarian Empire, ruling in the late 14th and early 15th centuries during its final struggle against Ottoman conquest.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.