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His ascension was contested , however , by a Samanid army which had arrived shortly before Vushmgir 's death for a joint campaign against the Buyid Rukn al-Daula .
 person: Vushmgir; person: Rukn al-Daula
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: Vushmgir, Rukn al-Daula 
Answer:
 person: Vushmgir; person: Rukn al-Daula