Representations of Xipe Totec first appeared at Xolalpan, near Teotihuacán, and at Texcoco, in connection with the Mazapan culture—that is, during the post-Classic Toltec phase (9th–12th century AD). The Aztecs adopted his cult during the reign of Axayacatl (1469–81). During Tlacaxipehualiztli (“Flaying of Men”), the second ritual month of the Aztec year, the priests killed human (human sacrifice) victims by removing their hearts. They flayed the bodies and put on the skins, which were dyed yellow and called teocuitlaquemitl (“golden clothes”). Other victims were fastened to a frame and put to death with arrows; their blood dripping down was believed to symbolize the fertile spring rains. A hymn sung in honour of Xipe Totec called him Yoalli Tlauana (“Night Drinker”) because beneficent rains fell during the night; it thanked him for bringing the Feathered Serpent, who was the symbol of plenty, and for averting drought.