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The history of Bavaria includes its earliest settlement by Iron Age Celtic tribes , followed by the conquests of the Roman Empire in the 1st century BC , when the territory was incorporated into the provinces of Raetia and Noricum .
 Bavaria, Roman Empire, Raetia, Noricum
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bavaria, Roman Empire, Raetia, Noricum