Sigh. Nothing in history really comes all that simply. The first thing you learn when looking up the Aztecs is they aren't
really called the Aztecs - at least that's not what they referred to themselves as. The word Aztec is a modern term, as the people that are being discussed are actually the Nahuatl-speaking people of Mexica ethnicity, typically part of the Triple Alliance empire in old-school central Mexico. By old-school I mean 14th to 16th centuries.
I also discovered that learning about the histories of countries that you know little about can have some problems that you wouldn't have anticipated. For instance, is Tepanec a king, city, or kingdom? Those were my first guesses, but as it turns out it's a people. Reading the wikipedia entry meant reading several other entries just to get the most basic understanding of the first. What follows is my best attempt at understanding it.
O.K., so a little history on the Mexica people. They were loyal to the Tepanecs, a much more powerful group at the time. The Mexica helped the Tepanecs in a war against the Acolhua city of Texcoco (the Acolhua name is mostly i