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: princes of Kievan Rus | Statement: [Kievan Rus military forces, usedBy, princes of Kievan Rus]

Target entity: princes of Kievan Rus
Context triple: [Kievan Rus military forces, usedBy, princes of Kievan Rus]

• A. King of Rus'
  King of Rus' was a medieval royal title used by rulers claiming sovereignty over the lands of the historical Rus' people and principalities.
• B. Voivode of Kiev
  The Voivode of Kiev was a high-ranking noble and provincial governor in the Polish–Lithuanian Commonwealth, overseeing the administration and defense of the Kiev Voivodeship.
• C. Grand Prince of Kiev
  The Grand Prince of Kiev was the supreme ruler of Kievan Rus', traditionally regarded as the foremost prince among the East Slavic principalities and a central figure in early medieval Eastern European politics.
• D. Yaroslavichi
  Yaroslavichi was the princely dynasty of the descendants of Yaroslav the Wise that ruled key principalities of Kievan Rus', including Chernigov.
• E. Prince of Volodymyr
  Prince of Volodymyr was a medieval Ruthenian princely title associated with the rulers of the important regional center of Volodymyr in the historical region of Volhynia.
• 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: princes of Kievan Rus
Triple: [Kievan Rus military forces, usedBy, princes of Kievan Rus]

The princes of Kievan Rus were medieval East Slavic rulers who governed a loose federation of principalities centered on Kyiv, shaping the region’s political, military, and cultural development from the 9th to the 13th centuries.

Target entity: princes of Kievan Rus
Target entity description: The princes of Kievan Rus were medieval East Slavic rulers who governed a loose federation of principalities centered on Kyiv, shaping the region’s political, military, and cultural development from the 9th to the 13th centuries.

• A. King of Rus'
  King of Rus' was a medieval royal title used by rulers claiming sovereignty over the lands of the historical Rus' people and principalities.
• B. Voivode of Kiev
  The Voivode of Kiev was a high-ranking noble and provincial governor in the Polish–Lithuanian Commonwealth, overseeing the administration and defense of the Kiev Voivodeship.
• C. Grand Prince of Kiev
  The Grand Prince of Kiev was the supreme ruler of Kievan Rus', traditionally regarded as the foremost prince among the East Slavic principalities and a central figure in early medieval Eastern European politics.
• D. Yaroslavichi
  Yaroslavichi was the princely dynasty of the descendants of Yaroslav the Wise that ruled key principalities of Kievan Rus', including Chernigov.
• E. Prince of Volodymyr
  Prince of Volodymyr was a medieval Ruthenian princely title associated with the rulers of the important regional center of Volodymyr in the historical region of Volhynia.
• F. None of above. chosen