Thrace was a satrapy of the Achaemenid Empire. It was conquered by general Mardonius, under the reign of Darius the Great. Herdotus places the Thracians, along with the Hellespontines and Mariandynians, in district III/b of the Achaemenid Empire.[1] Satrap (Greek σατράπης satrápēs, from Old Persian xšaθrapā(van), i. ... The Achaemenid Empire (Old Persian: HakhÄmanishiyan, ÙØ®Ø§Ù ÙØ´Ûا٠also frequently, the Achaemenid Persian Empire.) (559 BCâ330 BC) was the first of the Persian Empires to rule over significant portions of Greater Iran. ... Mardonius was a Persian commander during the Persian Wars with Greece in the 5th century BC. He was the son of Gobryas and the son-in-law of Darius I of Persia, whose daughter Artozostra he had married. ... Seal of Darius I, showing the king hunting on his chariot, and the symbol of Ahuramazda Darius the Great (Pers. ...