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Grigore III Ghica was twice the Prince of Moldavia between 29 March 1764 – 3 February 1767 and September 1774 – 10 October 1777 and of Wallachia : 28 October 1768 – November 1769 .
 Grigore III Ghica, Wallachia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Grigore III Ghica, Wallachia