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The struggle between the Aragonese kings of Aragon and the French kings of Naples for the possession of Sicily was at this time going on ; and Roger by then one of the most experienced military commanders of his time , was called to the service of Frederick , king of Sicily , who gave him the rank of vice-admiral .
 location: Sicily; person: Roger; person: Frederick , king of Sicily
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: Sicily, Roger, Frederick , king of Sicily 
Answer:
 location: Sicily; person: Roger; person: Frederick , king of Sicily