God G was the sun god of the ancient Maya. In the Classic period and the Postclassic period, he was referred to either as Ahau Kin (Ahaw K'in) or Kinich Ahau (K'inich Ahau, K'inich Ajaw). One of the most famous pieces of jade found in the ancient Maya land is a jade head bearing his appearance, from Altun Ha. His head has also been used to decorate temples.
There are variances in how Kinich Ahau was drawn. In Mesoamerican Mythology: A Guide to the Gods, Heroes, Rituals, and Beliefs of f Mexico and Central America he is described as having several distinguishing features: a hooked nose (a spiral often heading out from it in profile drawings); eyes that looked like crosses in full view but with an eye that looked like a square in profile; and sometimes a beard that had sections curling at the corners of his mouth.
Star Gods of the Maya: Astronomy in Art, Folklore, and Calendars says some similar things but also says some different things. It uses examples of Kinich Ahau found in the codices: in the Madrid Codex he is depicted as a aged being with crooked teeth; but in the Dresden Codex he is depicted to be around middle age, though on a table concerning eclipses he is drawn with a beard. The book also says that during the Postclassic period, Kinich Ahau was drawn with the glyph for the day Kin on his head or body. Sometimes, he was drawn with fangs or with one tooth.
Kinich Ahau was the sun, and was believed to turn into a jaguar as he went through Xibalbá each night. He was the patron of the day Muluc (also spelled Muluk), and was associated with Maya rulers and warriors as well as jaguars.
Change of Kinich Ahau's Patronage of Kings
The association of Kinich Ahau with kings changed over time. In the Classic period it was very common for a ruler to say he had a connection with the god. However this changed to become less common in the Postclassic period, as did the prominence of Kinich Ahau.
A God or an Aspect?
Kinich Ahau might not actually be a god by himself. There is a possibility that he is only an aspect of Itzamná (God D), a creator god (Itzamná has been identified as having an aspect named Kinich Ahau Itzamná).
"The Ancient Maya: New Perspectives"; Heather Irene McKillop; 2004
"The Ancient Maya"; Robert. J Sharer, Loa P. Traxler; 2006
"Prehistoric Mesoamerica"; Richard E. W. Adams; 1991
"Star Gods of the Maya: Astronomy in Art, Folklore, and Calendars"; Susan Milbrath; 2000
"Mesoamerican Mythology: A Guide to the Gods, Heroes, Rituals, and Beliefs of f Mexico and Central America"; Kay Almere Read, Jason J. Gonzalez; 2002