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Some subsequent ancient historians , despite following in his footsteps , criticised Herodotus , starting with Thucydides .
 Herodotus, Thucydides
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Herodotus, Thucydides