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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 .
 person: Diocletian; location: Nicomedia; person: Constantine; person: Constantius Chlorus; person: Maximian
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Diocletian, Nicomedia, Constantine, Constantius Chlorus, Maximian 
Answer:
 person: Diocletian; location: Nicomedia; person: Constantine; person: Constantius Chlorus; person: Maximian