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His son Dirk was still a boy at this time , but Arnulf 's widow Luitgard managed to retain the county for her son with support from first Emperor Otto III and later her brother-in-law , Emperor Henry II .
 person: Dirk; person: Arnulf; person: Emperor Otto III; person: Emperor Henry II
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: Dirk, Arnulf, Emperor Otto III, Emperor Henry II 
Answer:
 person: Dirk; person: Arnulf; person: Emperor Otto III; person: Emperor Henry II