http://agathe.gr/democracy/overthrow_and_revolution.html
Overthrow and Revolution In 514 B.C. the tyrant Hipparchos was stabbed to death. The murder, actually the result of a love feud, was quickly deemed a political act of assassination and the perpetrators, ... The murder, actually the result of a love feud, was quickly deemed a political act of assassination and the perpetrators, Harmodios and Aristogeiton, were proclaimed heroes and tyrannicides. ... This fragment is probably part of the original base under the statues of Harmodios and Aristogeiton, who assassinated Hipparchos. ... A handbook of the Roman period on poetic meters, surviving in Renaissance copies, preserves more of the inscription: "A great light shone upon the Athenians when Aristogeiton and Harmodios slew Hipparchos."