140669
After Harun 's death , Rafi chose to surrender himself to Harun 's son and new governor of Khurasan , al-Ma ' mun .
 Harun, Harun
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Harun, Harun