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The naval Battle of Ostia took place in 849 between some Saracen pirates and an Italian league of Papal , Neapolitan , Amalfitan and Gaetan ships .
 Ostia, Papal, Amalfitan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ostia, Papal, Amalfitan