In Aztec mythology, Xolotl was a god of fire and lightning. He was commonly depicted as a dog-headed man and was a soul-guide for the dead. He was also god of twins, monsters, misfortune, sickness, and deformities. Xolotl is the canine brother and twin of Quetzalcoatl, the pair being sons of the virgin Chimalma. He is the dark personification of Venus, the evening star, and was associated with heavenly fire. The Axolotl is named after him.