Priapus was the son of Aphrodite and Dionysus, an ancient god of fertility and vegetation. Images of this phallic deity or his genitals were placed in gardens and about houses to ensure prosperity and protection from evil spirits.

An impressive Priapus from Pompeii

Related Resources:

• Hellenismos/Greek Revival
  The Hellenistic revival...modern attempts to reconstruct the rich religious traditions of Ancient Greece.
• Religio Romana
  Religio Romana is the main name under which various Neopagan groups attempt to accurately reconstruct ancient Roman Pagan worship.