It's truly impossible to talk about Libra mythology without also referencing the Virgo myth. The myth of the constellation Libra and the myth of the constellation Virgo are intrinsically tied together in a way that no other two constellation myths could be.
A great deal of this has to do with the controversy surrounding the Virgo myth and its origins. As I explain in the Virgo myth article, the figure that represents that constellation is largely under debate.
If you don't want to read the article in full, I'll cut to the conclusion. I believe that the best representative for the Virgo zodiac symbol is the star goddess Astraea.
Where does this fit into Libra mythology? The answer lies in Astraea herself. The most common and relevant explanation of the constellation Libra is that the scales that represent the Libra constellation belong to the figure of the constellation Virgo.
This creates a very interesting issue for both constellation myths. If the scales are indeed that of Virgo, then it stands to reason that the figure in Virgo must have to do with justice, as that is what the scales represent. The only problem is that most people believe that the Virgo myth has to do with a virgin, a theme which seemingly has nothing to do with justice, so how does one reckon the one myth story with the other?
Enter the controversy. (If you're confused at this point, then please go read the Virgo myth article. That will make everything much easier to understand.)
Let's pause and talk about Libra mythology on its own for a moment. There is very little controversy over the representative symbol of Libra on its own. Nobody disagrees that the symbol representing Libra is a set of scales, and that those scales represent the scales of justice. They also represent balance and temperance, as well as the dark side of Libra astrology, which is essentially the opposite of those traits. Libras must be careful to maintain balance and not lose themselves into the beckoning chaos around them - but this is a story for another day.
Okay, so we know that the myth of the constellation Libra is tied to the myth of the constellation Virgo. And we know that I believe that Astraea is the key figure who represents the Virgo zodiac symbol. Now here's the big explanation that ties it all together: Astraea also represents Libra mythology.
How can this be? One figure representing two constellation myths?
I know, it sounds a bit odd, but it makes perfect sense. Astraea was a virgin goddess of justice. The only virgin goddess of justice who was also a primary caretaker of humanity (the true meaning of Virgo).
The woman holding the ear of corn in Virgo is Astraea. The scales of justice that glide by her side in the zodiac are her scales. The two never leave one another's side, forever connecting the two constellations with a single mythology.
Of course, I could be wrong. But if I am, then it's Virgo that is represented by someone else. The scales are undoubtedly those of Astraea, and if she is not the caretaker figure shown in the Virgo myth, then she is surely both herself and the scales represented in Libra mythology.
Again, if you haven't read the articles about the Virgo myth or Astraea, I highly recommend them. The mythology of Libra simply can't be explained without them.