The first political monument erected by the Athenian democracy was the group of the tyrannicides Harmodius and Aristogiton who, in 514 B. C., killed the tyrant Hipparcus. The two bronze statues by Critius and Nesiotes were set up in 477 B. C. in the Agora of Athens and they show the mortal attack of the aristocrats. The Prado head belongs to a herm which may have decorated the garden of a Roman villa near Tivoli. The bust with its modern inscription was added in the eighteenth century.