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He was caught up in the abortive Leinster revolt of 999 – 1000 , after which he was forced to submit to the King of Munster , Brian Boru .
 Leinster, Brian Boru
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leinster, Brian Boru