16146
Since the 12th century the area was part of the Holy Roman Empire ( Duchy of Pomerania ) , 1648-1945 Prussia and Germany .
 Holy Roman Empire, Duchy of Pomerania, Prussia, Germany
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Holy Roman Empire, Duchy of Pomerania, Prussia, Germany