312992
He became governor of Yi Province ( 益州 ) , succeeding his father Liu Yan and ruled the region until 214 , when he surrendered to Liu Bei .
 Liu Yan, Liu Bei
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Liu Yan, Liu Bei