259371
It would have been built before the Norman conquest , about the year 1051 , by Normans in the service of Osbern Pentecost , a follower of Ralph de Mantes and supporter of Edward the Confessor .
 Osbern Pentecost, Ralph de Mantes, Edward the Confessor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Osbern Pentecost, Ralph de Mantes, Edward the Confessor