History of the Peloponnesian War

When therefore the festival arrived, Hippias, with his body-guard, was arranging outside of the walls, in what is called the Ceramicus, how the several parts of the procession were to proceed.

And when they saw one of their accomplices in familiar conversation with Hippias, (for he was easy of access to all,) they were alarmed, and thought that some information had been laid against them, and that they would be almost immediately arrested. They wished therefore to avenge themselves beforehand, if possible, on the man who had aggrieved them, and for whose punishment they were exposing themselves to all that danger;

and so they rushed straightway within the gates, and meeting with Hipparchus by the Leocorium, at once fell on him in a reckless manner, under the influence of the most vehement passion, inspired by love in the one case, and by insult in the other, and smote him, and slew him.

Now one of them, namely, Aristogiton, escaped from the guards at the moment, through the crowd running up; but was seized afterwards, and disposed of in no gentle manner. Harmodius was immediately slain on the spot.