All right, so I'm a bit vague about the Aztecs. But I'm not alone in this. Everyone knows the name, but not that many people know who they were. In fact, as this winter's eponymous blockbuster show, Aztecs, at London's Royal Academy makes clear, not even they really knew who they were. The Aztecs invented themselves. They were a made-up civilization. Like that doomed chocolate bar, they were a me-too product. A bunch of migrants who stumbled into someone else's backyard in what we now call Mexico, and selected the bits they wanted from the famous older names around them - Toltecs, Olmecs, Tepanecs. They cobbled together a religion based on sun worship and ritual sacrifice, and then invented a history, a mythical island kingdom called Aztlan they were meant to have come from. This was a kit-of-parts culture, and it worked. A real life precursor to that computer strategy game, "Age of Empires".
