Uranus is the god of sky according to Greek mythology. Uranus was created by Gaia. And Uranus married Gaia. Uranus is also the god of the air.
Uranus is the ancestor of all gods. But Uranus trapped all his children in Gaia's inside. Aggravated by this, Gaia united with Kronos and started a war against Uranus. And Uranus has lost this war. After this war, Uranus is trapped underground by Kronos.