Inca and Andean Tradition
Illapa
The Thunder of the Inca state cult, imagined as a man in the sky with a sling and club who draws rain from the heavenly river; after the conquest he was widely identified with Saint James (Santiago).
No birth narrative survives; the Thunder appears in the chronicles as one of the great powers of the sky, ranked after the Creator and the Sun.
Illapa was one of the principal powers of the Cusco state cult, with his own chamber in the Coricancha according to Garcilaso and his own image, lands, and servants according to Molina and Cobo. Bernabé Cobo (1653), summarizing earlier reports, says the Andeans imagined him as a man in the sky with a club in one hand and a sling in the other: the crack of the sling was the thunder, the flash of his clothing the lightning, and he drew water from the river of the sky, the Milky Way, and poured it down as rain.

