388690
Some historians postulate a Fall of the Roman Empire c. 476 while others see the Byzantine Empire as its logical extension until the Fall of Constantinople to the Ottoman Empire in 1453 .
 Empire, Byzantine Empire, Constantinople, Ottoman Empire
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Empire, Byzantine Empire, Constantinople, Ottoman Empire