Herodotus and Thucydides were two of the earliest Greek historians. Herodotus, who lived in the 5th century BC, is considered the "Father of History" as he was one of the first historians to investigate events and write accounts of the past. He traveled widely and wrote about the Greco-Persian wars. Thucydides, a contemporary of Herodotus, is renowned for his history of the Peloponnesian War between Athens and Sparta from 431-404 BC. He is considered the father of scientific history for applying rigorous standards of evidence gathering and analysis. Both historians made major contributions to the development of history as an academic discipline.