Mexican archaeologists have excavated the core of the Pyramid of the Sun at Teotihuacan and discovered what is believed to be the original offering for the building, dated to approximately AD 50. The offering includes a green serpentine stone mask, eleven clay pots dedicated to the rain god, which the Aztecs called Tlaloc. There are also bones of an eagle and unidentified feline and canine animals. The offering includes considerable amounts of obsidian (arrows, bifaces and an eccentric) and three human figures decorated with eyes of shell and pyrite. There were originally three structures at the base and seven burials or sacrificial victims have been encountered.
It was the Aztecs that much later incorporated the ruins of the Pyramid of the Sun into their mythology. However, it seems that the pyramid, at least originally and partially, was dedicated to the rain god.