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In 1165 , Emperor Frederick I re-opened the tomb again and placed the emperor in a sarcophagus beneath the floor of the cathedral .
 person: Frederick I
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: Frederick I 
Answer:
 person: Frederick I