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After the Nguyễn came to power in 1802 , Duyệt became a high-ranking mandarin , serving under the first two Nguyễn emperors Gia Long and Minh Mạng .
 person: Nguyễn; person: Nguyễn; person: Gia Long; person: Minh Mạng
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Nguyễn; person: Nguyễn; person: Gia Long; person: Minh Mạng