Hermai/Herms
In Ancient Greece, Hermes was a phallic god of boundaries. His name, in the form herma, was applied to a wayside marker pile of stones; each traveller added a stone to the pile. In the 6th century BCE, Hipparchos, the son of Pisistratus, replaced the cairns that marked the midway point between each village deme at the central agora of Athens with a square or rectangular pillar of stone or bronze topped by a bust of Hermes with a beard. An erect phallus rose from the base. In the more primitive Mount Kyllini or Cyllenian herms, the standing stone or wooden pillar was simply a carved phallus. In Athens, herms were placed outside houses for good luck. "That a monument of this kind could be transformed into an Olympian god is astounding," Walter Burkert remarked.
In 415 BCE, when the Athenian fleet was about to set sail for Syracuse during the Peloponnesian War, all of the Athenian hermai were vandalized one night. The Athenians at the time believed it was the work of saboteurs, either from Syracuse or from the anti-war faction within Athens itself. Socrates' pupil Alcibiades was suspected of involvement, and Socrates indirectly paid for the impiety with his life.
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