He theorized that the peoples from the edge of Europe, from the Baltic, who had given the medieval Christians the most trouble in their conquest, might have been the Nahuas’ ancestors.76 Someone from the Old World, he was sure, had constructed boats and somehow made it to the (then unknown) New World. However it had happened, people had somehow ended up at Aztlan, at the Seven Caves, and from there had begun to wend their way south.