Final answer:
Herodotus and Thucydides are considered the first true historians, establishing the field of history by their systematic and evidence-based analysis of past events.
Step-by-step explanation:
Herodotus and Thucydides established history as a field of study. Herodotus is acknowledged as the 'Father of History' for his work, which chronicled the Persian War and went beyond storytelling to attempt explanations of human actions within a broader political and social context. Thucydides further contributed to the discipline with his emphasis on objectivity and evidence-based analysis, notably in his History of the Peloponnesian War, setting a precedent for modern historical methodology.