168562
In 820 , Emperor Xianzong died , and Li Heng took the throne ( as Emperor Muzong ) .
 Emperor Xianzong, Li, Emperor Muzong
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Emperor Xianzong, Li, Emperor Muzong