Herodotus claims to have traveled extensively around the ancient world, conducting interviews and collecting stories for his book, almost all of which covers territories of the Persian Empire. At the beginning of The Histories, Herodotus sets out his reasons for writing it:
Here are presented the results of the enquiry carried out by Herodotus of Halicarnassus. The purpose is to prevent the traces of human events from being erased by time, and to preserve the fame of the important and remarkable achievements produced by both Greeks and non-Greeks; among the matters covered is, in particular, the cause of the hostilities between Greeks and non-Greeks.
— Herodotus, The Histories, Robin Waterfield translation (2008)
