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A Phanariote ruler ( domnitor ) of the Ghica family , Grigore Ghica was assassinated by the Ottomans for opposing the annexation of the northwestern part of Moldavia ( later named Bukovina ) by the Habsburg Empire .
 Ghica family, Grigore Ghica, Ottomans
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ghica family, Grigore Ghica, Ottomans