268620
The author is usually thought of as the Cistercian abbot Ailred of Rievaulx , an identification that is probable if not certain .
 Ailred of Rievaulx
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ailred of Rievaulx