maenads were the female followers of Dionysus
Often the maenads were portrayed as inspired by him into a state of ecstatic frenzy, through a combination of dancing and drunken intoxication.
During these rites, the maenads would dress in fawn skins and carry a thyrsus, a long stick wrapped in ivy or vine leaves and tipped by a cluster of leaves, weave ivy-wreaths around their heads, and often handle or wear snakes.[2]
German philologist Walter Friedrich Otto writes that, "The Bacchae of Euripides gives us the most vital picture of the wonderful circumstance in which, as Plato says in the Ion, the god-intoxicated celebrants draw milk and honey from the streams. They strike rocks with the thyrsus, and water gushes forth. They lower the thyrsus to the earth, and a spring of wine bubbles up. If they want milk, they scratch up the ground with their fingers and draw up the milky fluid.
In Greek vase-painting, the frolicking of maenads and Dionysus is often a theme depicted on Greek kraters, used to mix water and wine. These scenes show the maenads in their frenzy running in the forests, often tearing to pieces any animal they happen to come across
Dionysus or Dionysos is the god of wine, the inspirer of ritual madness and ecstasy
He was also known as the Liberator (Eleutherios), freeing one from one's normal self, by madness, ecstasy, or wine. The divine mission of Dionysus was to mingle the music of the aulos and to bring an end to care and worry.
The retinue of Dionysus was called the thiasus and comprised chiefly of Maenads and satyrs.
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But doesn't the bull head just symbolize satanic or ritual.