In Aztec mythology, Tlahuizcalpantecuhtli ("lord of the star of the dawn", also spelled "Tlahuizcalpantecutli") was the personification of the morning star, which is the planet Venus as seen in the morning. His brother Xolotl was the planet Venus as the evening star. Tlahuizcalpantecuhtli was a manifestation of Quetzalcoatl.