Tlaloc was an important deity in pre-Aztec and Aztec religion, and was a major mesoamerican deity in general. He was a god of rain, fertility, and water. Most of the time he was a pretty nice guy, providing life and sustenance, soothing rains and healing waters, though he had a dark side and was feared for his ability to send hail, thunder and lightningstorms to earth. He was recognized in depictions for his goggle-like eyes and fangs. Child sacrifices were always a plus for ol’ Tlaloc, as with many mesoamerican gods.
In Aztec cosmology, the four corners of the universe are marked by “the four Tlalocs,” which hold up the sky. Our Tlaloc was the lord of the third sun (yes, there were three at one point) which was destroyed by fire. Guess these guys didn’t pick the right sun lord… just let it get destroyed like that? Lazy.