185633
Even with the growth of Persian military power under Khosrau 's reforms , the Sassanians were still uneasy at the prospect of attacking the Hephthalite on their own and began to seek allies .
 Khosrau
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Khosrau