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High medieval sources mention the assassination of King Demetrius Zvonimir ( 1089 ) , dying at the hands of his own people , who objected to a proposition by the pope to go on a campaign to aid the Byzantines against the Seljuk Turks .
 Demetrius Zvonimir
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Demetrius Zvonimir