Диего де Ланда
A large part of the most important Maya book, the Dresden Codex, is dedicated to the Chaacs, their locations, and activities. It illustrates the intimate relationship existing between the Chaacs, the Bacabs, and the aged goddess, Ixchel. The main source on the 16th-century Yucatec Maya, Bishop Diego de Landa, combines the four Chaacs with the four Bacabs and Pauahtuns into one concept. The Bacabs were aged deities governing the subterranean sphere and its water supplies.