In later Egyptian dynastic times, Ra was merged with the god Horus, as Ra-Horakhty ("Ra, who is Horus of the Two Horizons"). He was believed to rule in all parts of the created world: the sky, the earth, and the underworld. He was associated with the falcon or hawk. When in the New Kingdom the god Amun rose to prominence he was fused with Ra as Amun-Ra. During the Amarna Period, Akhenaten suppressed the cult of Ra in favour of another solar deity, the Aten, the deified solar disc, but after the death of Akhenaten the cult of Ra was restored.
All forms of life were believed to have been created by Ra, who called each of them into existence by speaking their secret names. Alternatively humans were created from Ra's tears and sweat, hence the Egyptians call themselves the "Cattle of Ra." In the myth of the Celestial Cow it is recounted how mankind plotted against Ra and how he sent his eye as the goddess Sekhmet to punish them. When she became bloodthirsty she was pacified by drinking beer mixed with red dye.
Interestingly, Ra was said to be created by the god Ptah in some myths; this lines up with Kanat awakening Ricardo's abilities in the game's story.