Moon Toad may predate other Chinese moon myths such as the Moon Hare.1 One version of the Moon Toad myth claims that the toad is the lady Chang E (aka Heng E) transformed. Imperial Readings of the Taiping Era (written between 977 and 983 CE3) quotes earlier works that mention a moon toad, including the astronomy book Ling Xian by Zhang Heng (78-139 CE)4:
Yi asked the Queen Mother of the West for the Medicine of Immortality. Yi's wife Heng E stole the medicine and flew to the moon. She installed herself on the moon and became a toad.