The Roman Green Man

The Roman Green Man was Bacchus, god of the garden and intoxication. He was celebrated annually in the Bacchanalia festival where people would partake of entheogenic communion to induce religious visions. The main purpose of these visions was to meet the goddess Venus (up in the sky).
In this painting by Hans von Aachen we see Venus and Cupid, her first cherub, embraced by Bacchus as he holds the communion grail in his hand. There are many such depictions of the two together, sometimes with Ceres who was the goddess of agriculture and grain crops. Since the entheogen ergot grows as a fungus on wheat grain, this may be the ingredient used in the Roman Bacchanalia.