Darius the Great was a powerful king of the Persian Empire who ruled from 522 to 486 BCE. He is best known for expanding the empire to its greatest size, stretching from Egypt to India. Darius implemented a system of provinces, called satrapies, which helped him manage his vast territory more effectively. He also introduced a standardized currency, making trade easier across the empire. In addition to his military achievements, Darius was a skilled administrator and builder. He commissioned the construction of impressive structures, including the grand palace at Persepolis. Darius is remembered for his contributions to governance and culture, leaving a lasting legacy in history.