The Origins of the Vestal Colt

i gather there's a big mythology component. Can you take me through the origins of it? It's all a little bit murky, i think that's the first thing to set up. Nothing here i say should go on the record as being definitive. People still argue about this kind of stuff. What we know about, sort of the mythical story is that there are vestal virgins outside of rome, before it exists,. who contribute to the foundation story.