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The Fatimid caliphate was founded by al-Mahdi Billah , a descendant of Fatimah , the daughter of Muhammad , in the early 10th century .
 location: Fatimid; person: al-Mahdi Billah; person: Fatimah; person: Muhammad
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Fatimid; person: al-Mahdi Billah; person: Fatimah; person: Muhammad