61376
The origins of Villa Bordoni date back to the 11th century , when all that stood there were a stone tower or a keep , with thick walls and arrow slits , attached to a solid dungeon for prisoners of war .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None