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After Triffyn succeeded Owain , nothing is known about the realm of Dyfed before Hyfaidd went to Alfred the Great in the 880s to request help opposing Rhodri the Great 's younger son Cadell .
 person: Alfred the Great; person: Rhodri the Great; person: Cadell
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: Alfred the Great, Rhodri the Great, Cadell 
Answer:
 person: Alfred the Great; person: Rhodri the Great; person: Cadell