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The Nuttall Encyclopedia
Eldest son of Hystaspes, king of the Persians; subdued subject places that had revolted, reorganised the empire, carried his conquests as far as India, subdued Thrace and Macedonia, declared war against the Athenians; in 492 B.C. sent an expedition against Greece, which was wrecked in a storm off Athos; sent a second, which succeeded in crossing over, but was defeated in a famous battle at Marathon, 490 B.C.
Wood, James, ed. Entry for 'Darius I.'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/d/darius-i.html. Frederick Warne & Co Ltd. London. 1900.