What is "nanahuatzin"

In Aztec mythology, the god Nanahuatzin or Nanahuatl (or Nanauatzin, the suffix -tzin implies respect or familiarity; ), the most humble of the gods, sacrificed himself in fire so that he would continue to shine on Earth as the sun, thus becoming the sun god. Nanahuatzin means "full of sores." According to a translation of the histoire du mechique, Nanahuatzin is the son of Itzpapalotl and Cuzcamiahu or Tonan, but was adopted by Piltzintecuhtli and Xochiquetzal. In the Codex Borgia, Nanahuatzin is represented as a man emerging from a fire. This was originally interpreted as an illustration of cannibalism. He is probably an aspect of Xolotl.