- Darius Hystaspesthe Great, 558?–486? b.c., king of Persia 521–486.
- known as Darius the Great, surname Hystaspis. ?550–486 bc, king of Persia (521–486), who extended the Persian empire and crushed the revolt of the Ionian city states (500). He led two expeditions against Greece but was defeated at Marathon (490)