The Tezcatlipoca were the four sons of the Lord and Lady of Our Duality and Aztec gods.
Each son was differentiated by colour and watched over a cardinal direction. Quetzalcoatl was the White Tezcatlipoca. He was white-skinned and bearded. According to legend, he was overthrown by the Black Tezcatlipoca and exiled across the ocean, but would return in the year One Reed. Xipe Totec was the Red Tezcatlipoca and the god of spring. He wore a human skin like overalls. The Blue Tezcatlipoca was Huitzilopochtli, the patron of the Aztecs and guardian of the south. (PROSE: The Left-Handed Hummingbird)
According to the Tenth Doctor, Tezcatlipoca was the Aztec god otherwise known as "Smoking Mirror", who liked black obsidian. (COMIC: Revolutions of Terror)