Polybius was a Greek historian from the 2nd century BC who wrote a history of Rome's rise to power. He utilized both written sources and first-hand accounts to compile evidence for his histories. Polybius believed in writing a "general history" that examined the overall progression and interconnection of events, rather than focusing on isolated accounts, in order to provide the fullest understanding. His overarching goals were to make history practical and useful for military and political affairs, while still maintaining factual accuracy over poetic exaggeration.