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A Christian armada , commanded by Caesar , son of Sergius I of Naples , was assembled off recently refortified Ostia , and Pope Leo IV came out to bless it and communicate the troops ( i.e. , perform a Mass ) .
 person: Caesar; person: Sergius I of Naples; location: Ostia; person: Pope Leo IV
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: Caesar, Sergius I of Naples, Ostia, Pope Leo IV 
Answer:
 person: Caesar; person: Sergius I of Naples; location: Ostia; person: Pope Leo IV