6158
: :E. Princess Maria of Greece and Denmark ( 1876–1940 ) , married Grand Duke George Mikhaelovich of Russia , had 2 daughters ; married Perikles Ioannidis , no issue
 Princess Maria of Greece and Denmark, Grand Duke George Mikhaelovich of Russia, Perikles Ioannidis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Princess Maria of Greece and Denmark, Grand Duke George Mikhaelovich of Russia, Perikles Ioannidis