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Senators were stripped of the command of legions and most provincial governorships , as it was felt that they lacked the specialized military upbringing needed in an age of acute defense needs ; such posts were given to equestrians by Diocletian and his colleagues , following a practice enforced piecemeal by their predecessors .
 Diocletian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Diocletian