157916
Though the exact dates of his birth and death are unknown , he is said by Gallus Anonymus to have lived in the second half of the 11th century .
 Gallus Anonymus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gallus Anonymus