I recently had a dialogue with a fellow on debate.org (hereinafter DDO) about some supposed similarities between Dionysus and Jesus. I just responded to one of the parallels, but I decided to do some digging around about the supposed virgin birth of Dionysus. Usually when these things come up, nobody ever cites a primary source, and it's hard to get to the bottom of anything. So I thought I'd see if I could get to the bottom of this one and settle it once and for all.
Through googling around, I discovered that the fellow on DDO had cut and paste from an an article by D.M. Murdock/Acharya S. I read the section on the virgin birth to see if she would cite any primary sources that I could look at. Unfortunately, she cited nothing but secondary sources. But she said, "In the common myth about the birth of Dionysus/Bacchus, Semele is mysteriously impregnated by one of Zeus's bolts of lightning--an obvious miraculous/virgin conception." I decided to pursue this incident to see if I could get to the bottom of it.
To help me along, I posted a question about it in a closed group forum on facebook. One of the people there directed me to this article on pagan parallel saviors. The pagan parallel article cited an on line encyclopedia entry on the mother of Dionysus, Semele, that was written by James Hunter. It says:
Because Zeus slept with Semele secretly, Hera only found out about the affair after the girl was pregnant. Bent on revenge, Hera disguised herself and persuaded Semele to demand that Zeus come to her in all the splendor with which he visited Hera. As a result, Semele asked Zeus to grant an unspecified favor, and got him to swear by the river Styx that he would grant it. Unable to break his oath, Zeus came to her armed in his thunder and lightning, and Semele was destroyed. However, Zeus rescued the unborn child from the mother's ashes and sewed it in his thigh until it was ready to be born.I still wanted to see it in the primary source, so I kept looking. The savior god article also cited Ovid's Metamorphoses, so I googled "ovid metamorphoses semele" and found a primary source for this story in Ovid's Metamorphoses, Book III. It appears under two subtitles: "Juno sets out to destroy Semele" and "Semele is consumed by Jupiter's fire." Apparently, this is a Roman version of an earlier Greek story, and I still haven't found the Greek version. Juno is the same person as Hera, and Jupiter is Zeus. Other than the change in names, everything James Hunter said in the encyclopedia entry is true.
Zeus had been having an affair with Semele. Hera/Juno "was grieved by the fact that Semele was pregnant, with the seed of mighty Jove," aka Zeus. Since Semele was pregnant, Hera decided to get revenge by destroying Semele. She disguised herself as an old woman and visited Semele. She manipulates Semele into getting Zeus to promise to "assume all his powers before he embraces you," just as he does with Hera. Zeus doesn't want to do it because he knows it will kill Semele, but he can't back out of his promise. Zeus tries to limit his powers as much as he can, but he gathers the storm clouds and the thunder and lightening, etc., and appears to Semele. Predictably, she gets burned up. Zeus then rescues Dionysus/Bacchus who was "still unfinished," and sews him into his thigh until he is ready to be born.
So basically, D.M. Murdock had the wrong idea. She thought Zeus somehow got Semele pregnant with the use of a lightening bolt when in reality, Semele was pregnant already from sleeping with Zeus while he was disguised as a mortal man. The lightening played no role in Semele getting pregnant. It seems pretty clear to me that Semele was no virgin.
It's nice to finally get to the bottom of something, huh?
[UPDATE July 31, 2017]
I found another primary source for the conception and birth of Dionysus. It comes from The Library 3.4.3 by Apollodorus and dates to the second century AD. It agrees with the other sources that "Zeus loved Semele and bedded with her unknown to Hera." She became pregnant, and the rest of the story unfolds as in the other accounts with Hera tricking Semele, and Zeus accidentally killing her with lightening, then sewing Dionysus into his thigh. So again, Semele was not a virgin. This account gives a footnote that lists other primary sources for Semele and the birth of Dionysus, but I haven't looked at them all yet.
[UPDATE: October 16, 2021]
Here are a few more sources I found on this subject (One from the The Bachhae by Euripides discussed in the comments below).:
Hesiod, Theogony, 940-942
8th to 7th century BC
http://www.sacred-texts.com/cla/hesiod/theogony.htm
“And Semele, daughter of Cadmus was joined with him in love and bare him a splendid son, joyous Dionysus, -- a mortal woman an immortal son. And now they both are gods.”
Euripides, Bacchae,
5th century BC
“Dionysus:
I’ve arrived here in the land of Thebes,
I, Dionysus, son of Zeus, born to him
from Semele, Cadmus’ daughter, delivered
by a fiery midwife—Zeus’ lightning flash.”
“For my mother’s sisters have acted badly,
something they, of all people, should avoid.
They boasted aloud that I, Dionysus,
was no child of Zeus, claiming Semele,
once she was pregnant by some mortal man,
attributed her bad luck in bed to Zeus,
a story made up (they said) to trick Cadmus.
Those sisters state that’s why Zeus killed her,
because she lied about the man she’d slept with.”
“Chorus:
His mother dropped him early,
as her womb, in forceful birth pangs,
was struck by Zeus’ flying lightning bolt,
a blast which took her life.
Then Zeus, son of Cronos,
at once hid him away
in a secret birthing chamber,
buried in his thigh,
shut in with golden clasps,
concealed from Hera.”
“Pentheus:
This man claims
that Dionysus is a god, alleging
that once upon a time he was sewn up,
stitched inside Zeus’ thigh—but Dionysus
was burned to death, along with Semele,
in that lightning strike, because she’d lied.
She maintained that she’d had sex with Zeus.
All this surely merits harsh punishment,
death by hanging. Whoever this stranger is,
his insolence is an insult to me.”
Diodorus Siculus, Library of History, 4.2.2-3
1st century BC
http://www.theoi.com/Text/DiodorusSiculus4A.html#3
“[4.2.2] Semelê was loved by Zeus because of her beauty, but since he had his intercourse with her secretly and without speech she thought that the god despised her; consequently she made the request of him that he come to her embraces in the same manner as in his approaches to Hera.
[4.2.3] Accordingly, Zeus visited her in a way befitting a god, accompanied by thundering and lightning, revealing himself to her as he embraced her; but Semelê, who was pregnant and unable to endure the majesty of the divine presence, brought forth the babe untimely and was herself slain by the fire. Thereupon Zeus, taking up the child, handed it over to the care of Hermes, and ordered him to take it to the cave in Nysa,4 which lay between Phoenicia and the Nile, where he should deliver it to the nymphs that they should rear it and with great solicitude bestow upon it the best of care.
Ovid, Metamorphoses, 3.253-272
c. 8 AD
http://ovid.lib.virginia.edu/trans/Metamorph3.htm#476975709
“She [Hera/Juno] was grieved by the fact that Semele was pregnant, with the seed of mighty Jove. Swallowing words of reproach, she said ‘What, in truth, have I gained from frequent reproaches? I must attack her. If I am rightly to be called most powerful Juno, if it is right for me to hold the jewelled sceptre in my hand, if I am queen, and sister and wife of Jove, sister at least, then it is her I must destroy. Yet I think she is content with her secret, and the injury to my marriage will be brief. But she has conceived – and that damages me – and makes her crime visible in her swollen belly, and wants, what I have barely achieved, to be confirmed as the mother of Jupiter’s child, so great is her faith in her beauty. I will render that faith hollow. I am not Saturnia if she does not plunge into the Stygian waters, overwhelmed by Jove himself.’”
Philostratus of Lemnos (or his father-in-law, Lucius Flavius Philostratus, or Philostratus the Elder), Imagines, 1.14
3rd century AD
http://www.theoi.com/Text/PhilostratusElder1A.html#14
“A cloud of fire encompassing Thebes breaks into the dwelling of Cadmus as Zeus comes wooing Semele; and Semele apparently is destroyed, but Dionysus is born, by Zeus, so I believe, in the presence of the fire. And the form of Semele is dimly seen as she goes to the heavens, where the Muses will hymn her praises: but Dionysus leaps forth as his mother’s womb is rent apart and he makes the flame look dim, so brilliantly does he shine like a radiant star.”