56582
Church architecture The great churches of Kievan Rus ' , built after the adoption of Christianity in 988 , were the first examples of monumental architecture in the East Slavic lands .
 Kievan Rus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kievan Rus