His magnum opus is a long account of the Greco-Persian Wars that he called “The Histories.”
Before Herodotus, no writer had ever made such a systematic, thorough study of the past or tried to explain the cause-and-effect of its events.
Herodotus explained that he reported what he "saw and [what was] told to him." A sizable portion of the Histories has since been confirmed by modern historians and archaeologists.
The Histories
Ηροδότου Ιστορίαι