History of the Peloponnesian War

For the vulgar sort of Athenians think that Hipparchus was the tyrant, and slain by Harmodius and Aristogeiton, and know not that Hippias had the government, as being the eldest son of Pisistratus, and that Hipparchus and Thessalus were his brethren; and that Harmodius and Aristogeiton, suspecting that some of their accomplices had that day and at that instant discovered unto Hippias somewhat of their treason, did forbear Hippias as a man forewarned; and desirous to effect somewhat, though with danger, before they should be apprehended, lighting on Hipparchus slew him near the temple called Leocorium, whilst he was setting forth the Panathenaical show.