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Eventually he turned to Robert Guiscard , Duke of Calabria , who treated the abbot with great respect and invited him and his monks to settle in Calabria .
 Robert Guiscard, Calabria, Calabria
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert Guiscard, Calabria, Calabria