Darius I, also known as Darius the Great, was the third King of the Persian Achaemenid Empire. Some common synonyms for Darius I include "Darius the Persian", "Darius II", "King Darius", "Darius the Third", and "Darius the Son of Hystaspes". Darius I ruled from 522 BCE to 486 BCE and is known for his conflicts with Greece, especially the Persian Wars. He is also known for his ambitious construction projects, including the building of a new capital city, Persepolis. Darius I is considered one of the greatest Persian kings, with his reign marking a pivotal point in the history of the Achaemenid Empire.