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In the ensuing succession crisis , Ilia 's elder half brother and regent for the vacant throne , David , vied with Heraclius II 's son , Iulon .
 David, Heraclius
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 David, Heraclius