The Mixtec players of the Mesoamerican ballgame were sacrificed when the game was used to resolve a dispute between cities. The rulers would play a game instead of going to battle. The losing ruler would be sacrificed. The ruler "Eight Deer", who was considered a great ball player and who won several cities this way, was eventually sacrificed, because he attempted to go beyond lineage-governing practices, and to create an empire. The Maya held the belief that cenotes or limestone sinkholes were portals to the underworld and sacrificed human beings and tossed them down the cenote to please the water god Chaac. The most notable example of this is the "Sacred Cenote" at Chichén Itzá. Extensive excavations have recovered the remains of 42 individuals, half of them under twenty years old. Only in the Post-Classic era did this practice become as frequent as in central Mexico. In the Post-Classic period, the victims and the altar are represented as daubed in a hue now known as Maya Blue, obtained from the añil plant and the clay mineral palygorskite. The Aztecs were particularly noted for practicing human sacrifice on a large scale; an offering to Huitzilopochtli would be made to restore the blood he lost, as the sun was engaged in a daily battle. Human sacrifices would prevent the end of the world that could happen on each cycle of 52 years. In the 1487 re-consecration of the Great Pyramid of Tenochtitlan some estimate that 80,400 prisoners were sacrificed though numbers are difficult to quantify as all obtainable Aztec texts were destroyed by Christian missionaries during the period 1528–1548. The Aztec, also known as Mexica, periodically sacrificed children as it was believed that the rain god, Tlāloc, required the tears of children. According to Ross Hassig, author of "Aztec Warfare", "between 10,000 and 80,400 people" were sacrificed in the ceremony. The old reports of numbers sacrificed for special feasts have been described as "unbelievably high" by some authors and that on cautious reckoning, based on reliable evidence, the numbers could not have exceeded at most several hundred per year in Tenochtitlan. The real number of sacrificed victims during the 1487 consecration is unknown. Michael Harner, in his 1997 article "The Enigma of Aztec Sacrifice", estimates the number of persons sacrificed in central Mexico in the 15th century as high as 250,000 per year.