307504
As he was crossing Hounslow Heath one night , on his way from Berkeley Castle to London , his travelling carriage was stopped by a man on horseback , who put his head in at the window and said , ‘ I believe you are Lord Berkeley ?
 Berkeley, Berkeley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Berkeley, Berkeley