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About 1580 he entered the service of Christian , the eldest son of Augustus I , elector of Saxony , and when Christian succeeded his father as elector in 1586 , became his most influential counselor .
 Christian, Augustus I
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Christian, Augustus I