"Huitzilopōchtli, the God of War "

The Aztec culture and language were highly visual, communicating through imagery.  This depiction of Huitzilopochtli is from the 16th century manuscript called the Codex Telleriano-Remensis.  See page-by-page images of the whole document at the Foundation for Mesoamerican Studies.  Because Huitzilopōchtli--who was typically depicted as a hummingbird, with emblems of a snake and a mirror--was in constant battle with the darkness, his energy had to be replenished by sacrifices in order to ensure the survival of the sun.   

Aztec God of War
Public DomainAztec God of War