The Aztec social classes were a lot like the Inca and the Maya. At the top was the ruling family, then it was nobles, priests and lords, then it was merchants and traders, and last was communers and slaves. As you can see it is not like the medevial times, where the priest is on top. The Aztec did a lot of sacrafice, and slaves would always get sacraficed. Here is a website to the Aztec Social Classes.