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He and Giorgakis Olympios reached an agreement with Tudor in the early months of 1821 , but , since the relation between the two factions soured as an effect of Russian and Ottoman Empire intervention , the two ( joined by Dimitrie Macedonski ) decided to arrest Vladimirescu ( who was to be executed on June 7 ) .
 Giorgakis Olympios, Tudor, Ottoman Empire, Dimitrie Macedonski, Vladimirescu
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Giorgakis Olympios, Tudor, Ottoman Empire, Dimitrie Macedonski, Vladimirescu