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His father served as a hostage in the court of Diocletian in Nicomedia , thus securing the loyalty of Constantine 's father , Constantius Chlorus , who was " caesar " to Maximian in the west at this time .
 Diocletian, Nicomedia, Constantine, Constantius Chlorus, Maximian
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, Nicomedia, Constantine, Constantius Chlorus, Maximian