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The Treaty of Bärwalde ( ; ; ) of 23 January 1631 was a treaty concluding an alliance between Sweden and France during the Thirty Years ' War , shortly after Sweden had invaded Northern Germany then occupied by Ferdinand II , Holy Roman Emperor 's forces .
 Bärwalde, Sweden, France, Sweden, Ferdinand II , Holy Roman Emperor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bärwalde, Sweden, France, Sweden, Ferdinand II , Holy Roman Emperor