Statistics for occurrence #1 of “Heliopolis” in book 2, chapter 3, section 1 of Herodotus, The Histories:

...us; and I visited Thebes and Heliopolis, too, for this very purpose, because I wished to know if the people of those places would tell me the same story as the priests at Memphis; for the people of Heliopolis are said to be the most learned of the Egyptians.
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Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
† Heliopolis (Egypt) 22 22 0 0 0 user votes
Heliopolis (Lebanon) 24 0 0 0 0 user votes
Heliopolis (Rio de Janeiro, Brazil) 0 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.