Who is the primordial god of the sky?

The story behind the answer

Uranus (Ouranos) is the primordial god who personifies the sky itself in Greek myth, the earliest sky-father and consort of Gaia (Earth). Together they produced the Titans, Cyclopes, and Hundred-Handers. This differs from Aether (the pure upper air/light), Zephyr (the gentle west wind), and Helios (the sun god), who are later or more specific deities of the atmosphere and heavens.

Memorize it this way: Uranus = uranology (the study of the heavens) = the Sky. His overthrow by his son Cronus—who castrated him—explains cosmic succession; from Uranus’s blood sprang the Furies and Giants, and Aphrodite arose from sea foam. Distinguishing roles helps: Helios shines, Zephyr breezes, Aether glows, but Uranus is the vast dome above all.