In ancient Greece, before his role as protector of merchants and travelers, Hermes was a phallic god, associated with fertility, luck, roads and borders. His name comes from the word herma (plural hermai) referring to a square or rectangular pillar of stone, terracotta, or bronze; a bust of Hermes' head, usually with a beard, sat on the top of the pillar, and male genitals adorned the base. The hermai were used as boundary markers on roads and borders. In Athens, they were placed outside houses for good luck.

In May, 415 BC, when the Athenian fleet was about to set sail for Syracuse during the Peloponnesian War (see Sicilian Expedition), all of the Athenian hermai were vandalized. This was a horribly impious act and many people believed it threatened the success of the expedition. Though it was never proven, the Athenians at the time believed it was the work of saboteurs, either from Syracuse or anti-war doves from Athens itself. In fact, Alcibiades was accused of being the originator of the crime. He denied the accusations and offered to stand trial, but the Athenians did not want to disrupt the expedition any further. Later, however, his political enemies had him charged and sentenced to death in absentia, both for the mutilation of the herms, and the supposedly related crime of profaning the Eleusinian Mysteries.