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Initially , Cottius and his own son of the same name after him continued to hold power as client kings ; afterwards , under Nero a procurator was appointed and it officially became a Roman province .
 person: Cottius; person: Nero
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Cottius, Nero 
Answer:
 person: Cottius; person: Nero