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Since the ancient era , it has been a battlefield between Ancient Athens , the ruler of the island , and Sparta , the ruler of Milos .
 location: Ancient; location: Athens; location: Sparta; location: Milos
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Ancient; location: Athens; location: Sparta; location: Milos