Itztlacoliuhqui-Ixquimilli is Curved Point of Obsidian - Knife Eye Bundle, the god of frost, ice, cold, winter, sin, punishment and human misery. He is also the god of objectivity and blind-folded justice. He is a variant of Tezcatlipoca and associated with the night and the north.
Itztlacoliuhqui once was Tlahuizcalpantecuhtli (Lord of the Dawn, Venus as the Morning Star), but after a shooting match with the Sun Tonatiuh during the creation of the Fifth World, he was punished by Tonatiuh and transformed into Itztlacoliuhqui, god of stone and coldness.
Itztlacoliuhqui rules over trecena 1-Cuetzpalin (lizard).