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He left no children ; but in later years his sister 's grandson Philipp Melanchthon was like a son to him till the Reformation estranged them .
 Philipp Melanchthon, Reformation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Philipp Melanchthon, Reformation