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Meanwhile , though , Emperor Xuanzong , who had not known that Emperor Suzong had taken imperial title , continued to issue edicts as emperor , and on August 15 , 756 , he issued an edict giving Li Heng and three other sons of his — Li Lin and his younger brothers Li Qi ( 李琦 ) the Prince of Sheng and Li Gong ( 李珙 ) the Prince of Feng — responsibility zones for them to command over , with Li Heng in overall command .
 Emperor Xuanzong, Emperor, Li, Li Lin, Li, Li, Li
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 Xuanzong, Emperor, Li, Li Lin, Li, Li, Li