Columbia subject headings:
Cleomenes III, King of Sparta, -219 B.C.
Marathon, Battle of, Greece, 490 B.C.
Harvard subject headings:
Greece--History--Ionian Revolt, 499-494 B.C.
Greece--History--Persian Wars, 500-449 B.C.
Princeton subject headings:
Greece--History--Persian Wars, 500-449 B.C.--Early works to 1800.
Herodotus. Book 6.
Marathon, Battle of, Greece, 490 B.C.--Early works to 1800.