From Norman's PM: Let's consider what is happening in New Phrygia, we have a European Disease environment, and pretty strong population growth in Europe (due to a better understanding of basic hygiene). Countering these pressures, we probably have Mithraic warrior 'societies' / war bands, that seek out the best warriors and don't really care where they come from, only that they are good. I believe that this would result in fairly fast westward expansion of ideas, techniques and even people, but also an integration of larger indian groups into the grand scheme of things. Native Warrior societies would eat up some of Mithrasm's belief systems, and the Mithraic hierarchy with it's ravens, lions and other symbols, would also be attractive to warriors. But the expansion will run into the extremely bloody and violent Aztecs (Nahuatl). Do they run into them before or after the technology has arrived?, I think after, so we have the Nahuatl Empire in the South expanding into our Northern Mexico and South Texas, a bunch of (by now) nomadic tribesmen with both horses and Mithraic overlays on top of native belief systems, and (from the East) a European dominated Mithraic culture. By this time the Nahuatl are probably armored, not many horses, although some are beginning to arrive, so they'd be largely infantry. Facing them we have very mobile, ightly armored tribesmen, backed by the more advanced Eastern Kingdoms of New Phyria.