There are several synonyms for the term "Darius The Great" which was the title used by several ancient rulers of the Achaemenid Empire. Some of the synonyms include Darius I, Darius the First, Darius the Persia, and Darius the King. Darius the Great was known for his military skill and for expanding the Persian Empire to its greatest extent. He is also remembered for his works of architecture and for introducing a standard currency throughout his empire. His name is synonymous with power, conquest, and great leadership, and he continues to be a prominent figure in the history of Iran and the Middle East.