Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: Boril of Bulgaria | Statement: [Kaloyan of Bulgaria, successor, Boril of Bulgaria]

Target entity: Boril of Bulgaria
Context triple: [Kaloyan of Bulgaria, successor, Boril 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. Krum of Bulgaria
  Krum of Bulgaria was a powerful early 9th-century Bulgarian khan known for his military victories against the Byzantine Empire and for laying foundations of a strong Bulgarian state.
• C. Boris I of Bulgaria
  Boris I of Bulgaria was the 9th-century Bulgarian monarch best known for converting his realm to Christianity and laying the foundations of Slavic literacy and culture.
• D. 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.
• E. Ivan Sratsimir of Bulgaria
  Ivan Sratsimir of Bulgaria was a 14th-century Bulgarian tsar who ruled the Vidin-based western Bulgarian kingdom during the final decades before the Ottoman conquest.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: Boril of Bulgaria
Triple: [Kaloyan of Bulgaria, successor, Boril of Bulgaria]

Boril of Bulgaria was a Tsar of the Second Bulgarian Empire in the early 13th century, known for his troubled reign marked by internal strife and military setbacks following the rule of Kaloyan.

Target entity: Boril of Bulgaria
Target entity description: Boril of Bulgaria was a Tsar of the Second Bulgarian Empire in the early 13th century, known for his troubled reign marked by internal strife and military setbacks following the rule of Kaloyan.

• 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. Krum of Bulgaria
  Krum of Bulgaria was a powerful early 9th-century Bulgarian khan known for his military victories against the Byzantine Empire and for laying foundations of a strong Bulgarian state.
• C. Boris I of Bulgaria
  Boris I of Bulgaria was the 9th-century Bulgarian monarch best known for converting his realm to Christianity and laying the foundations of Slavic literacy and culture.
• D. 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.
• E. Ivan Sratsimir of Bulgaria
  Ivan Sratsimir of Bulgaria was a 14th-century Bulgarian tsar who ruled the Vidin-based western Bulgarian kingdom during the final decades before the Ottoman conquest.
• F. None of above. chosen