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: John (son of Constantius III and Galla Placidia) | Statement: [Valentinian III, sibling, John (son of Constantius III and Galla Placidia)]

Target entity: John (son of Constantius III and Galla Placidia)
Context triple: [Valentinian III, sibling, John (son of Constantius III and Galla Placidia)]

• A. Flavius Julius Crispus
  Flavius Julius Crispus was a 4th-century Roman Caesar and eldest son of Emperor Constantine the Great, noted for his military successes before his mysterious execution.
• B. Arcadius
  Arcadius was a late 4th- and early 5th-century Roman emperor who ruled the Eastern Roman Empire and was the elder son of Theodosius I.
• C. Julian March
  Julian March is a historically contested border region in northeastern Italy and parts of present-day Slovenia and Croatia, known for its mixed ethnic population and disputes between Italy and Yugoslavia in the 20th century.
• D. Severus II
  Severus II was a Roman emperor of the early 4th century who ruled as a Western Augustus during the Tetrarchy before being overthrown in the civil wars that followed Diocletian’s abdication.
• E. Olybrius
  Olybrius was a short-lived 5th-century Western Roman emperor whose brief reign in 472 occurred during the empire’s final period of political fragmentation and decline.
• 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: John (son of Constantius III and Galla Placidia)
Triple: [Valentinian III, sibling, John (son of Constantius III and Galla Placidia)]

John was a late Roman imperial prince, the son of Emperor Constantius III and Empress Galla Placidia, and thus a member of the Theodosian dynasty.

Target entity: John (son of Constantius III and Galla Placidia)
Target entity description: John was a late Roman imperial prince, the son of Emperor Constantius III and Empress Galla Placidia, and thus a member of the Theodosian dynasty.

• A. Flavius Julius Crispus
  Flavius Julius Crispus was a 4th-century Roman Caesar and eldest son of Emperor Constantine the Great, noted for his military successes before his mysterious execution.
• B. Arcadius
  Arcadius was a late 4th- and early 5th-century Roman emperor who ruled the Eastern Roman Empire and was the elder son of Theodosius I.
• C. Julian March
  Julian March is a historically contested border region in northeastern Italy and parts of present-day Slovenia and Croatia, known for its mixed ethnic population and disputes between Italy and Yugoslavia in the 20th century.
• D. Severus II
  Severus II was a Roman emperor of the early 4th century who ruled as a Western Augustus during the Tetrarchy before being overthrown in the civil wars that followed Diocletian’s abdication.
• E. Olybrius
  Olybrius was a short-lived 5th-century Western Roman emperor whose brief reign in 472 occurred during the empire’s final period of political fragmentation and decline.
• F. None of above. chosen