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But this also ended up turning the province into a virtually independent state under the Tahirids , founded by a Persian " mawla " who rose to favour under Al-Ma ' mun .
 Tahirids, Al-Ma ' mun
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tahirids, Al-Ma ' mun