Tlahuizcalpantecuhtli (also Tlahuixcalpantecuhtli) is the Lord of the House of the Dawn, Venus as the Morning Star.
Tlahuixcalpantecuhtli is a manifestion of
, who has
Venus as the Evening Star
as his twin brother.
Tlahuizcalpantecuhtli is a god of war.
In Teotihuacán Tlahuixcalpantecuhtli attacked Tonatiuh, the newly created Sun , by throwing an atl-atl dart at him. Tlahuixcalpantecuhtli missed. Tonatiuh threw a dart back, piercing Tlahuixcalpantecuhtli through the head. This transformed Tlahuixcalpantecuhtli into Itztlacoliuhqui, god of stone and coldness .
In the tonalpohualli, Tlahuizcalpantecuhtli is the Lord of the Day for days with number 12 (mahtlactli-omome in Nahuatl).