HUITZILOPOCHTLI AND TLALOC

The reason that the Great Temple was dedicated to Huitzilopochtli and Tlaloc is that these two Gods  were considered companions of equal power.  Huitzilopochtli was especially important to the Aztecs because according to legend, every night Huitzilopochtli would fight the forces of darkness so that darkness would not take over the world.  The Aztec believed that the only way to increase Huitzilopochtli's power was to give him human blood.  So, many sacrifices were performed in his name.  Tlaloc was important to the Aztecs because they believed that he was a beneficial God who gave life and sustenance.  But, he was feared for his ability to send thunder and lightening, hale, and for being the lord of water.